2895 lines
83 KiB
Coq
2895 lines
83 KiB
Coq
From Ltac2 Require Ltac2.
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Import Ltac2.Notations.
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Import Ltac2.Control.
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Require Import ssreflect ssrbool.
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Require Import FunInd.
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Require Import Arith.Wf_nat.
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Require Import Psatz.
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From stdpp Require Import relations (rtc (..), rtc_once, rtc_r).
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From Hammer Require Import Tactics.
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Require Import Autosubst2.core Autosubst2.fintype Autosubst2.syntax.
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Ltac2 spec_refl () :=
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List.iter
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(fun a => match a with
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| (i, _, _) =>
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let h := Control.hyp i in
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try (specialize $h with (1 := eq_refl))
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end) (Control.hyps ()).
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Ltac spec_refl := ltac2:(spec_refl ()).
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Module ERed.
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Inductive R {n} : PTm n -> PTm n -> Prop :=
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(****************** Eta ***********************)
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| AppEta A a0 a1 :
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R a0 a1 ->
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R (PAbs A (PApp (ren_PTm shift a0) (VarPTm var_zero))) a1
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| PairEta a0 a1 :
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R a0 a1 ->
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R (PPair (PProj PL a0) (PProj PR a0)) a1
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(*************** Congruence ********************)
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| AbsCong A a0 a1 :
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R a0 a1 ->
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R (PAbs A a0) (PAbs A a1)
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| AppCong a0 a1 b0 b1 :
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R a0 a1 ->
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R b0 b1 ->
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R (PApp a0 b0) (PApp a1 b1)
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| PairCong a0 a1 b0 b1 :
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R a0 a1 ->
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R b0 b1 ->
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R (PPair a0 b0) (PPair a1 b1)
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| ProjCong p a0 a1 :
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R a0 a1 ->
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R (PProj p a0) (PProj p a1)
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| VarTm i :
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R (VarPTm i) (VarPTm i).
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Lemma refl n (a : PTm n) : R a a.
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Proof.
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elim : n / a; hauto lq:on ctrs:R.
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Qed.
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Derive Dependent Inversion inv with (forall n (a b : PTm n), R a b) Sort Prop.
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Lemma AppEta' n A a0 a1 (u : PTm n) :
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u = (PAbs A (PApp (ren_PTm shift a0) (VarPTm var_zero))) ->
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R a0 a1 ->
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R u a1.
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Proof. move => ->. apply AppEta. Qed.
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Lemma renaming n m (a b : PTm n) (ξ : fin n -> fin m) :
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R a b -> R (ren_PTm ξ a) (ren_PTm ξ b).
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Proof.
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move => h. move : m ξ.
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elim : n a b /h.
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move => n A a0 a1 ha iha m ξ /=.
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eapply AppEta' with (A := A); eauto. by asimpl.
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all : qauto ctrs:R.
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Qed.
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Lemma morphing_ren n m p (ρ0 ρ1 : fin n -> PTm m) (ξ : fin m -> fin p) :
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(forall i, R (ρ0 i) (ρ1 i)) ->
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(forall i, R ((funcomp (ren_PTm ξ) ρ0) i) ((funcomp (ren_PTm ξ) ρ1) i)).
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Proof. eauto using renaming. Qed.
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Lemma morphing_ext n m (ρ0 ρ1 : fin n -> PTm m) a b :
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R a b ->
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(forall i, R (ρ0 i) (ρ1 i)) ->
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(forall i, R ((scons a ρ0) i) ((scons b ρ1) i)).
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Proof. hauto q:on inv:option. Qed.
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Lemma morphing_up n m (ρ0 ρ1 : fin n -> PTm m) :
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(forall i, R (ρ0 i) (ρ1 i)) ->
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(forall i, R (up_PTm_PTm ρ0 i) (up_PTm_PTm ρ1 i)).
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Proof. hauto l:on ctrs:R use:morphing_ext, morphing_ren unfold:up_PTm_PTm. Qed.
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Lemma morphing n m (a b : PTm n) (ρ0 ρ1 : fin n -> PTm m) :
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(forall i, R (ρ0 i) (ρ1 i)) ->
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R a b -> R (subst_PTm ρ0 a) (subst_PTm ρ1 b).
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Proof.
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move => + h. move : m ρ0 ρ1. elim : n a b / h => n.
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move => A a0 a1 ha iha m ρ0 ρ1 hρ /=.
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eapply AppEta' with (A := A); eauto. by asimpl.
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all : hauto lq:on ctrs:R use:morphing_up.
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Qed.
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Lemma substing n m (a : PTm n) b (ρ : fin n -> PTm m) :
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R a b ->
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R (subst_PTm ρ a) (subst_PTm ρ b).
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Proof.
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hauto l:on use:morphing, refl.
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Qed.
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End ERed.
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Inductive SNe {n} : PTm n -> Prop :=
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| N_Var i :
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SNe (VarPTm i)
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| N_App a b :
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SNe a ->
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SN b ->
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SNe (PApp a b)
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| N_Proj p a :
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SNe a ->
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SNe (PProj p a)
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with SN {n} : PTm n -> Prop :=
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| N_Pair a b :
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SN a ->
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SN b ->
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SN (PPair a b)
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| N_Abs A a :
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SN a ->
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SN (PAbs A a)
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| N_SNe a :
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SNe a ->
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SN a
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| N_Exp a b :
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TRedSN a b ->
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SN b ->
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SN a
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with TRedSN {n} : PTm n -> PTm n -> Prop :=
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| N_β A a b :
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SN b ->
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TRedSN (PApp (PAbs A a) b) (subst_PTm (scons b VarPTm) a)
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| N_AppL a0 a1 b :
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TRedSN a0 a1 ->
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TRedSN (PApp a0 b) (PApp a1 b)
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| N_ProjPairL a b :
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SN b ->
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TRedSN (PProj PL (PPair a b)) a
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| N_ProjPairR a b :
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SN a ->
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TRedSN (PProj PR (PPair a b)) b
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| N_ProjCong p a b :
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TRedSN a b ->
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TRedSN (PProj p a) (PProj p b).
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Scheme sne_ind := Induction for SNe Sort Prop
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with sn_ind := Induction for SN Sort Prop
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with sred_ind := Induction for TRedSN Sort Prop.
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Combined Scheme sn_mutual from sne_ind, sn_ind, sred_ind.
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Check sn_mutual.
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Lemma ered_sn_preservation n :
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(forall (a : PTm n) (s : SNe a), forall b, ERed.R a b -> SNe b) /\
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(forall (a : PTm n) (s : SN a), forall b, ERed.R a b -> SN b) /\
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(forall (a b : PTm n) (_ : TRedSN a b), forall c, ERed.R a c -> exists d, TRedSN c d /\ ERed.R b d).
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Proof.
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move : n. apply sn_mutual => n.
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- sauto lq:on.
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- sauto lq:on.
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- sauto lq:on.
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- move => a b ha iha hb ihb b0.
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inversion 1; subst.
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+ have /iha : (ERed.R (PProj PL a0) (PProj PL b0)) by sauto lq:on.
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admit.
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+ sauto lq:on.
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- move => A a ha iha b.
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inversion 1; subst.
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+ have : ERed.R (PApp (ren_PTm shift a0) (VarPTm var_zero)) (PApp (ren_PTm shift b) (VarPTm var_zero)).
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apply ERed.AppCong; eauto using ERed.refl.
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sfirstorder use:ERed.renaming.
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move /iha.
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admit.
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+ sauto lq:on.
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- sauto lq:on.
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- sauto lq:on.
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- move => A a b ha iha c h0.
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inversion h0; subst.
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inversion H1; subst.
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+ exists (PApp a1 b1). split. admit.
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asimpl.
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sauto lq:on.
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+ have {}/iha := H3 => iha.
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exists (subst_PTm (scons b1 VarPTm) a2).
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split.
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sauto lq:on.
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hauto lq:on use:ERed.morphing, ERed.refl inv:option.
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- sauto lq:on.
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- move => a b hb ihb c.
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elim /ERed.inv => //= _.
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move => p a0 a1 ha [*]. subst.
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elim /ERed.inv : ha => //= _.
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+ move => a0 a2 ha [*]. subst.
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exists (PProj PL a1).
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split. admit.
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sauto lq:on.
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+ sauto lq:on rew:off.
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- move => a b ha iha c.
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elim /ERed.inv => //=_.
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move => p a0 a1 + [*]. subst.
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elim /ERed.inv => //=_.
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+ move => a0 a2 h [*]. subst.
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exists (PProj PR a1).
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split. admit.
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sauto lq:on.
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+ sauto lq:on.
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- sauto lq:on.
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Admitted.
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Module RRed.
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Inductive R {n} : PTm n -> PTm n -> Prop :=
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(****************** Eta ***********************)
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| AppAbs A a b :
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R (PApp (PAbs A a) b) (subst_PTm (scons b VarPTm) a)
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| ProjPair p a b :
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R (PProj p (PPair a b)) (if p is PL then a else b)
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(*************** Congruence ********************)
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| AbsCong A a0 a1 :
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R a0 a1 ->
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R (PAbs A a0) (PAbs A a1)
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| AppCong0 a0 a1 b :
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R a0 a1 ->
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R (PApp a0 b) (PApp a1 b)
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| AppCong1 a b0 b1 :
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R b0 b1 ->
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R (PApp a b0) (PApp a b1)
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| PairCong0 a0 a1 b :
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R a0 a1 ->
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R (PPair a0 b) (PPair a1 b)
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| PairCong1 a b0 b1 :
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R b0 b1 ->
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R (PPair a b0) (PPair a b1)
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| ProjCong p a0 a1 :
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R a0 a1 ->
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R (PProj p a0) (PProj p a1).
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Derive Dependent Inversion inv with (forall n (a b : PTm n), R a b) Sort Prop.
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End RRed.
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Module ERedM.
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Inductive R {n} (a : PTm n) : PTm n -> Prop :=
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| refl : R a a
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| step b : ERed.R a b -> R a b.
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End ERedM.
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Inductive Wt {n} (Γ : fin n -> Ty) : PTm n -> Ty -> Prop :=
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| T_Var i :
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Wt Γ (VarPTm i) (Γ i)
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| T_Abs a A B :
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Wt (scons A Γ) a B ->
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Wt Γ (PAbs A a) (Fun A B)
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| T_App b a A B :
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Wt Γ b (Fun A B) ->
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Wt Γ a A ->
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Wt Γ (PApp b a) B
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| T_Pair a b A B :
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Wt Γ a A ->
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Wt Γ b B ->
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Wt Γ (PPair a b) (Prod A B)
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| T_Proj p a A B :
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Wt Γ a (Prod A B) ->
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Wt Γ (PProj p a) (if p is PL then A else B).
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Module Wt.
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Lemma renaming n m (Γ : fin n -> Ty) Δ (ξ : fin n -> fin m) a A :
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(forall i, Γ i = Δ (ξ i)) ->
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Wt Γ a A ->
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Wt Δ (ren_PTm ξ a) A.
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Proof.
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move => + h. move : m Δ ξ. elim : n Γ a A / h; try hauto inv:option lq:on ctrs:Wt.
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Qed.
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Lemma antirenaming n m (Γ : fin n -> Ty) Δ (ξ : fin n -> fin m) a A :
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(forall i, Γ i = Δ (ξ i)) ->
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Wt Δ (ren_PTm ξ a) A ->
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Wt Γ a A.
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Proof.
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move E : (ren_PTm ξ a) => u + h.
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move : n a ξ Γ E.
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elim : m Δ u A / h=> n /=.
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- hauto q:on ctrs:Wt inv:PTm.
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- move => Γ a A B ha iha m []//= A0 p ξ Δ [? ?]. subst.
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hauto q:on inv:option ctrs:Wt.
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- move => Γ b a A B hb ihb ha iha m [] //=.
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move => p p0 ξ Δ [*]. subst.
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hauto lq:on rew:off ctrs:Wt.
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- move => Γ a b A B ha iha hb ihb m []//=.
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hauto lq:on ctrs:Wt.
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- move => Γ p a A B ha iha m []//=.
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move => p0 p1 ξ Δ [*]. subst.
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hauto lq:on rew:off ctrs:Wt.
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Qed.
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Local Lemma morphing_upren n m (Γ : fin n -> Ty) Δ
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(ρ : fin n -> PTm m) A :
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(forall i, Wt Δ (ρ i) (Γ i)) ->
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(forall i, Wt (scons A Δ) ((up_PTm_PTm ρ) i) ((scons A Γ) i)).
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Proof.
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sblast inv:option use:renaming.
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Qed.
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Lemma morphing n m (Γ : fin n -> Ty) Δ (ρ : fin n -> PTm m) a A:
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(forall i, Wt Δ (ρ i) (Γ i)) -> Wt Γ a A -> Wt Δ (subst_PTm ρ a) A.
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Proof.
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move => + h. move : m Δ ρ;
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elim : n Γ a A /h;
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hauto lq:on use:morphing_upren ctrs:Wt.
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Qed.
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Lemma substing n (Γ : fin n -> Ty) a b A B:
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Wt (scons B Γ) a A ->
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Wt Γ b B ->
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Wt Γ (subst_PTm (scons b VarPTm) a) A.
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Proof.
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move => h0 h1. apply : morphing; eauto.
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hauto lq:on ctrs:Wt inv:option.
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Qed.
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Lemma preservation_beta n Γ a b A :
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@Wt n Γ a A ->
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RRed.R a b ->
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Wt Γ b A.
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Proof.
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move => + h0. move : Γ A.
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elim : n a b /h0=> n //=; hauto lq:on inv:Wt ctrs:Wt use:substing.
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Qed.
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Lemma typing_unique n Γ a A B :
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@Wt n Γ a A ->
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Wt Γ a B ->
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A = B.
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Proof.
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move => h. move : B.
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elim : n Γ a A /h=>//=; hauto lq:on rew:off ctrs:Wt inv:Wt.
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Qed.
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Lemma preservation_eta n Γ a b A :
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@Wt n Γ a A ->
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ERed.R a b ->
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Wt Γ b A.
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Proof.
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move => + h0. move : Γ A.
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elim : n a b /h0=> n //=; try qauto inv:Wt ctrs:Wt use:substing.
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- move => A a Γ ξ hA.
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inversion hA; subst.
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inversion H2; subst.
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inversion H4; subst.
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apply antirenaming with (Γ := Γ) in H1;
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sfirstorder use:typing_unique.
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- move => a Γ U.
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inversion 1; subst.
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inversion H2; subst.
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inversion H4; subst.
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suff : Prod A B0 = Prod A0 B by congruence.
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eauto using typing_unique.
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- hauto lq:on inv:Wt ctrs:Wt.
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Qed.
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End Wt.
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Lemma eta_postponement n Γ a b c A :
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@Wt n Γ a A ->
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ERed.R a b ->
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RRed.R b c ->
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exists d, rtc RRed.R a d /\ ERed.R d c.
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Proof.
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move => + h.
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move : Γ c A.
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elim : n a b /h => //=.
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- move => n A a Γ c A0 hA0 ha.
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exists (PAbs A (PApp (ren_PTm shift c) (VarPTm var_zero))).
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split. admit.
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apply ERed.AppEta.
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- move => n a Γ c A ha ha0.
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exists (PPair (PProj PL c) (PProj PR c)).
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split. admit.
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apply ERed.PairEta.
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- move => n A a0 a1 ha iha Γ c A0 ha0.
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elim /RRed.inv => //= _.
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move => A1 a2 a3 ha' [*]. subst.
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inversion ha0; subst.
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move : iha H2 ha'. repeat move/[apply].
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move => [d [h0 h1]].
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exists (PAbs A d).
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split. admit.
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hauto lq:on ctrs:ERed.R.
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- move => n a0 a1 b ha iha Γ c A hab hab0.
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elim /RRed.inv : hab0 => //= _.
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move => A0 a2 b0 [*]. subst.
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+ inversion ha; subst.
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* exists (subst_PTm (scons b VarPTm) a2).
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split.
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apply : rtc_l.
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apply RRed.AppAbs.
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asimpl.
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apply rtc_once. apply RRed.AppAbs.
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admit.
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* exfalso.
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move : hab. clear.
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hauto lq:on inv:Wt.
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* inversion hab; subst.
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exists (subst_PTm (scons b VarPTm) a1).
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split.
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apply rtc_once.
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apply RRed.AppAbs.
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admit.
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+ move => a2 a3 b0 ha0 [*]. subst.
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have : exists Γ A, @Wt n Γ a0 A by hauto lq:on inv:Wt.
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move => [Γ0 [A0] hA0].
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move : iha hA0 ha0. repeat move /[apply].
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move => [d [h0 h1]].
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exists (PApp d b).
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split. admit.
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hauto lq:on ctrs:ERed.R.
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+ move => a2 b0 b1 hb [*]. subst.
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sauto lq:on.
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- move => n a b0 b1 hb ihb Γ c A hu hu'.
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elim /RRed.inv : hu' => //=_.
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+ move => A0 a0 b2 [*]. subst.
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move {ihb}.
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eexists.
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split. apply rtc_once.
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apply RRed.AppAbs.
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admit.
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+ sauto lq:on.
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+ move => a0 b2 b3 hb0 [*]. subst.
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have [? [? ]] : exists Γ A, @Wt n Γ b0 A by hauto lq:on inv:Wt.
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move : ihb hb0. repeat move/[apply].
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move => [d [h0 h1]].
|
||
exists (PApp a d).
|
||
split. admit.
|
||
sauto lq:on.
|
||
- move => n a0 a1 b ha iha Γ u A hu.
|
||
elim / RRed.inv => //= _.
|
||
+ move => a2 a3 b0 h [*]. subst.
|
||
have [? [? ]] : exists Γ A, @Wt n Γ a0 A by hauto lq:on inv:Wt.
|
||
move : iha h. repeat move/[apply].
|
||
move => [d [h0 h1]].
|
||
exists (PPair d b).
|
||
split. admit.
|
||
sauto lq:on.
|
||
+ move => a2 b0 b1 h [*]. subst.
|
||
sauto lq:on.
|
||
- move => n a b0 b1 hb ihb Γ c A hu.
|
||
elim / RRed.inv => //=_.
|
||
move => a0 a1 b2 ha [*]. subst.
|
||
+ sauto lq:on.
|
||
+ move => a0 b2 b3 hb0 [*]. subst.
|
||
have [? [? ]] : exists Γ A, @Wt n Γ b0 A by hauto lq:on inv:Wt.
|
||
move : ihb hb0. repeat move/[apply].
|
||
move => [d [h0 h1]].
|
||
exists (PPair a d).
|
||
split. admit.
|
||
sauto lq:on.
|
||
- move => n p a0 a1 ha iha Γ u A hu.
|
||
elim / RRed.inv => //=_.
|
||
+ move => p0 a2 b0 [*]. subst.
|
||
inversion ha; subst.
|
||
* exfalso.
|
||
move : hu. clear. hauto q:on inv:Wt.
|
||
* exists (match p with
|
||
| PL => a2
|
||
| PR => b0
|
||
end).
|
||
split. apply : rtc_l.
|
||
apply RRed.ProjPair.
|
||
apply rtc_once. clear.
|
||
hauto lq:on use:RRed.ProjPair.
|
||
admit.
|
||
* eexists.
|
||
split. apply rtc_once.
|
||
apply RRed.ProjPair.
|
||
admit.
|
||
* eexists.
|
||
split. apply rtc_once.
|
||
apply RRed.ProjPair.
|
||
admit.
|
||
+ move => p0 a2 a3 ha0 [*]. subst.
|
||
have [? [? ]] : exists Γ A, @Wt n Γ a0 A by hauto lq:on inv:Wt.
|
||
move : iha ha0; repeat move/[apply].
|
||
move => [d [h0 h1]].
|
||
exists (PProj p d).
|
||
split.
|
||
admit.
|
||
sauto lq:on.
|
||
Admitted.
|
||
|
||
(* Trying my best to not write C style module_funcname *)
|
||
Module Par.
|
||
Inductive R {n} : PTm n -> PTm n -> Prop :=
|
||
(***************** Beta ***********************)
|
||
| AppAbs a0 a1 b0 b1 :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PApp (PAbs a0) b0) (subst_PTm (scons b1 VarPTm) a1)
|
||
| AppPair a0 a1 b0 b1 c0 c1:
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R c0 c1 ->
|
||
R (PApp (PPair a0 b0) c0) (PPair (PApp a1 c1) (PApp b1 c1))
|
||
| ProjAbs p a0 a1 :
|
||
R a0 a1 ->
|
||
R (PProj p (PAbs a0)) (PAbs (PProj p a1))
|
||
| ProjPair p a0 a1 b0 b1 :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PProj p (PPair a0 b0)) (if p is PL then a1 else b1)
|
||
|
||
(****************** Eta ***********************)
|
||
| AppEta a0 a1 :
|
||
R a0 a1 ->
|
||
R a0 (PAbs (PApp (ren_PTm shift a1) (VarPTm var_zero)))
|
||
| PairEta a0 a1 :
|
||
R a0 a1 ->
|
||
R a0 (PPair (PProj PL a1) (PProj PR a1))
|
||
|
||
(*************** Congruence ********************)
|
||
| Var i : R (VarPTm i) (VarPTm i)
|
||
| AbsCong a0 a1 :
|
||
R a0 a1 ->
|
||
R (PAbs a0) (PAbs a1)
|
||
| AppCong a0 a1 b0 b1 :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PApp a0 b0) (PApp a1 b1)
|
||
| PairCong a0 a1 b0 b1 :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PPair a0 b0) (PPair a1 b1)
|
||
| ProjCong p a0 a1 :
|
||
R a0 a1 ->
|
||
R (PProj p a0) (PProj p a1)
|
||
| ConstCong k :
|
||
R (PConst k) (PConst k)
|
||
| Univ i :
|
||
R (PUniv i) (PUniv i)
|
||
| Bot :
|
||
R PBot PBot.
|
||
|
||
Lemma refl n (a : PTm n) : R a a.
|
||
elim : n /a; hauto ctrs:R.
|
||
Qed.
|
||
|
||
Lemma AppAbs' n a0 a1 (b0 b1 t : PTm n) :
|
||
t = subst_PTm (scons b1 VarPTm) a1 ->
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PApp (PAbs a0) b0) t.
|
||
Proof. move => ->. apply AppAbs. Qed.
|
||
|
||
Lemma ProjPair' n p (a0 a1 b0 b1 : PTm n) t :
|
||
t = (if p is PL then a1 else b1) ->
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PProj p (PPair a0 b0)) t.
|
||
Proof. move => > ->. apply ProjPair. Qed.
|
||
|
||
Lemma AppEta' n (a0 a1 b : PTm n) :
|
||
b = (PAbs (PApp (ren_PTm shift a1) (VarPTm var_zero))) ->
|
||
R a0 a1 ->
|
||
R a0 b.
|
||
Proof. move => ->; apply AppEta. Qed.
|
||
|
||
Lemma renaming n m (a b : PTm n) (ξ : fin n -> fin m) :
|
||
R a b -> R (ren_PTm ξ a) (ren_PTm ξ b).
|
||
Proof.
|
||
move => h. move : m ξ.
|
||
elim : n a b /h.
|
||
move => *; apply : AppAbs'; eauto; by asimpl.
|
||
all : match goal with
|
||
| [ |- context[var_zero]] => move => *; apply : AppEta'; eauto; by asimpl
|
||
| _ => qauto ctrs:R use:ProjPair'
|
||
end.
|
||
Qed.
|
||
|
||
|
||
Lemma morphing n m (a b : PTm n) (ρ0 ρ1 : fin n -> PTm m) :
|
||
(forall i, R (ρ0 i) (ρ1 i)) ->
|
||
R a b -> R (subst_PTm ρ0 a) (subst_PTm ρ1 b).
|
||
Proof.
|
||
move => + h. move : m ρ0 ρ1. elim : n a b/h.
|
||
- move => n a0 a1 b0 b1 ha iha hb ihb m ρ0 ρ1 hρ /=.
|
||
eapply AppAbs' with (a1 := subst_PTm (up_PTm_PTm ρ1) a1); eauto.
|
||
by asimpl.
|
||
hauto l:on use:renaming inv:option.
|
||
- hauto lq:on rew:off ctrs:R.
|
||
- hauto l:on inv:option use:renaming ctrs:R.
|
||
- hauto lq:on use:ProjPair'.
|
||
- move => n a0 a1 ha iha m ρ0 ρ1 hρ /=.
|
||
apply : AppEta'; eauto. by asimpl.
|
||
- hauto lq:on ctrs:R.
|
||
- sfirstorder.
|
||
- hauto l:on inv:option ctrs:R use:renaming.
|
||
- hauto q:on ctrs:R.
|
||
- qauto l:on ctrs:R.
|
||
- qauto l:on ctrs:R.
|
||
- hauto l:on inv:option ctrs:R use:renaming.
|
||
- qauto l:on ctrs:R.
|
||
- qauto l:on ctrs:R.
|
||
Qed.
|
||
|
||
Lemma substing n m (a b : PTm n) (ρ : fin n -> PTm m) :
|
||
R a b -> R (subst_PTm ρ a) (subst_PTm ρ b).
|
||
Proof. hauto l:on use:morphing, refl. Qed.
|
||
|
||
Lemma antirenaming n m (a : PTm n) (b : PTm m) (ξ : fin n -> fin m) :
|
||
R (ren_PTm ξ a) b -> exists b0, R a b0 /\ ren_PTm ξ b0 = b.
|
||
Proof.
|
||
move E : (ren_PTm ξ a) => u h.
|
||
move : n ξ a E. elim : m u b/h.
|
||
- move => n a0 a1 b0 b1 ha iha hb ihb m ξ []//=.
|
||
move => c c0 [+ ?]. subst.
|
||
case : c => //=.
|
||
move => c [?]. subst.
|
||
spec_refl.
|
||
move : iha => [c1][ih0]?. subst.
|
||
move : ihb => [c2][ih1]?. subst.
|
||
eexists. split.
|
||
apply AppAbs; eauto.
|
||
by asimpl.
|
||
- move => n a0 a1 b0 b1 c0 c1 ha iha hb ihb hc ihc m ξ []//=.
|
||
move => []//= t t0 t1 [*]. subst.
|
||
spec_refl.
|
||
move : iha => [? [*]].
|
||
move : ihb => [? [*]].
|
||
move : ihc => [? [*]].
|
||
eexists. split.
|
||
apply AppPair; hauto. subst.
|
||
by asimpl.
|
||
- move => n p a0 a1 ha iha m ξ []//= p0 []//= t [*]. subst.
|
||
spec_refl. move : iha => [b0 [? ?]]. subst.
|
||
eexists. split. apply ProjAbs; eauto. by asimpl.
|
||
- move => n p a0 a1 b0 b1 ha iha hb ihb m ξ []//= p0 []//= t t0[*].
|
||
subst. spec_refl.
|
||
move : iha => [b0 [? ?]].
|
||
move : ihb => [c0 [? ?]]. subst.
|
||
eexists. split. by eauto using ProjPair.
|
||
hauto q:on.
|
||
- move => n a0 a1 ha iha m ξ a ?. subst.
|
||
spec_refl. move : iha => [a0 [? ?]]. subst.
|
||
eexists. split. apply AppEta; eauto.
|
||
by asimpl.
|
||
- move => n a0 a1 ha iha m ξ a ?. subst.
|
||
spec_refl. move : iha => [b0 [? ?]]. subst.
|
||
eexists. split. apply PairEta; eauto.
|
||
by asimpl.
|
||
- move => n i m ξ []//=.
|
||
hauto l:on.
|
||
- move => n a0 a1 ha iha m ξ []//= t [*]. subst.
|
||
spec_refl.
|
||
move :iha => [b0 [? ?]]. subst.
|
||
eexists. split. by apply AbsCong; eauto.
|
||
done.
|
||
- move => n a0 a1 b0 b1 ha iha hb ihb m ξ []//= t t0 [*]. subst.
|
||
spec_refl.
|
||
move : iha => [b0 [? ?]]. subst.
|
||
move : ihb => [c0 [? ?]]. subst.
|
||
eexists. split. by apply AppCong; eauto.
|
||
done.
|
||
- move => n a0 a1 b0 b1 ha iha hb ihb m ξ []//= t t0[*]. subst.
|
||
spec_refl.
|
||
move : iha => [b0 [? ?]]. subst.
|
||
move : ihb => [c0 [? ?]]. subst.
|
||
eexists. split=>/=. by apply PairCong; eauto.
|
||
done.
|
||
- move => n p a0 a1 ha iha m ξ []//= p0 t [*]. subst.
|
||
spec_refl.
|
||
move : iha => [b0 [? ?]]. subst.
|
||
eexists. split. by apply ProjCong; eauto.
|
||
done.
|
||
- hauto q:on inv:PTm ctrs:R.
|
||
- hauto q:on inv:PTm ctrs:R.
|
||
- hauto q:on inv:PTm ctrs:R.
|
||
Qed.
|
||
|
||
End Par.
|
||
|
||
Module Pars.
|
||
Lemma renaming n m (a b : PTm n) (ξ : fin n -> fin m) :
|
||
rtc Par.R a b -> rtc Par.R (ren_PTm ξ a) (ren_PTm ξ b).
|
||
Proof.
|
||
induction 1; hauto lq:on ctrs:rtc use:Par.renaming.
|
||
Qed.
|
||
|
||
Lemma substing n m (a b : PTm n) (ρ : fin n -> PTm m) :
|
||
rtc Par.R a b ->
|
||
rtc Par.R (subst_PTm ρ a) (subst_PTm ρ b).
|
||
induction 1; hauto l:on ctrs:rtc use:Par.substing.
|
||
Qed.
|
||
|
||
Lemma antirenaming n m (a : PTm n) (b : PTm m) (ξ : fin n -> fin m) :
|
||
rtc Par.R (ren_PTm ξ a) b -> exists b0, rtc Par.R a b0 /\ ren_PTm ξ b0 = b.
|
||
Proof.
|
||
move E :(ren_PTm ξ a) => u h.
|
||
move : a E.
|
||
elim : u b /h.
|
||
- sfirstorder.
|
||
- move => a b c h0 h1 ih1 a0 ?. subst.
|
||
move /Par.antirenaming : h0.
|
||
move => [b0 [h2 ?]]. subst.
|
||
hauto lq:on rew:off ctrs:rtc.
|
||
Qed.
|
||
|
||
#[local]Ltac solve_s_rec :=
|
||
move => *; eapply rtc_l; eauto;
|
||
hauto lq:on ctrs:Par.R use:Par.refl.
|
||
|
||
#[local]Ltac solve_s :=
|
||
repeat (induction 1; last by solve_s_rec); apply rtc_refl.
|
||
|
||
Lemma ProjCong n p (a0 a1 : PTm n) :
|
||
rtc Par.R a0 a1 ->
|
||
rtc Par.R (PProj p a0) (PProj p a1).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma PairCong n (a0 a1 b0 b1 : PTm n) :
|
||
rtc Par.R a0 a1 ->
|
||
rtc Par.R b0 b1 ->
|
||
rtc Par.R (PPair a0 b0) (PPair a1 b1).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma AppCong n (a0 a1 b0 b1 : PTm n) :
|
||
rtc Par.R a0 a1 ->
|
||
rtc Par.R b0 b1 ->
|
||
rtc Par.R (PApp a0 b0) (PApp a1 b1).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma AbsCong n (a b : PTm (S n)) :
|
||
rtc Par.R a b ->
|
||
rtc Par.R (PAbs a) (PAbs b).
|
||
Proof. solve_s. Qed.
|
||
|
||
End Pars.
|
||
|
||
Definition var_or_const {n} (a : PTm n) :=
|
||
match a with
|
||
| VarPTm _ => true
|
||
| PBot => true
|
||
| _ => false
|
||
end.
|
||
|
||
|
||
(***************** Beta rules only ***********************)
|
||
Module RPar.
|
||
Inductive R {n} : PTm n -> PTm n -> Prop :=
|
||
(***************** Beta ***********************)
|
||
| AppAbs a0 a1 b0 b1 :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PApp (PAbs a0) b0) (subst_PTm (scons b1 VarPTm) a1)
|
||
| AppPair a0 a1 b0 b1 c0 c1:
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R c0 c1 ->
|
||
R (PApp (PPair a0 b0) c0) (PPair (PApp a1 c1) (PApp b1 c1))
|
||
| ProjAbs p a0 a1 :
|
||
R a0 a1 ->
|
||
R (PProj p (PAbs a0)) (PAbs (PProj p a1))
|
||
| ProjPair p a0 a1 b0 b1 :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PProj p (PPair a0 b0)) (if p is PL then a1 else b1)
|
||
|
||
|
||
(*************** Congruence ********************)
|
||
| Var i : R (VarPTm i) (VarPTm i)
|
||
| AbsCong a0 a1 :
|
||
R a0 a1 ->
|
||
R (PAbs a0) (PAbs a1)
|
||
| AppCong a0 a1 b0 b1 :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PApp a0 b0) (PApp a1 b1)
|
||
| PairCong a0 a1 b0 b1 :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PPair a0 b0) (PPair a1 b1)
|
||
| ProjCong p a0 a1 :
|
||
R a0 a1 ->
|
||
R (PProj p a0) (PProj p a1)
|
||
| ConstCong k :
|
||
R (PConst k) (PConst k)
|
||
| Univ i :
|
||
R (PUniv i) (PUniv i)
|
||
| Bot :
|
||
R PBot PBot.
|
||
|
||
Derive Dependent Inversion inv with (forall n (a b : PTm n), R a b) Sort Prop.
|
||
|
||
Lemma refl n (a : PTm n) : R a a.
|
||
Proof.
|
||
induction a; hauto lq:on ctrs:R.
|
||
Qed.
|
||
|
||
Lemma AppAbs' n a0 a1 (b0 b1 t : PTm n) :
|
||
t = subst_PTm (scons b1 VarPTm) a1 ->
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PApp (PAbs a0) b0) t.
|
||
Proof. move => ->. apply AppAbs. Qed.
|
||
|
||
Lemma ProjPair' n p (a0 a1 b0 b1 : PTm n) t :
|
||
t = (if p is PL then a1 else b1) ->
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PProj p (PPair a0 b0)) t.
|
||
Proof. move => > ->. apply ProjPair. Qed.
|
||
|
||
Lemma renaming n m (a b : PTm n) (ξ : fin n -> fin m) :
|
||
R a b -> R (ren_PTm ξ a) (ren_PTm ξ b).
|
||
Proof.
|
||
move => h. move : m ξ.
|
||
elim : n a b /h.
|
||
move => *; apply : AppAbs'; eauto; by asimpl.
|
||
all : qauto ctrs:R use:ProjPair'.
|
||
Qed.
|
||
|
||
Lemma morphing_ren n m p (ρ0 ρ1 : fin n -> PTm m) (ξ : fin m -> fin p) :
|
||
(forall i, R (ρ0 i) (ρ1 i)) ->
|
||
(forall i, R ((funcomp (ren_PTm ξ) ρ0) i) ((funcomp (ren_PTm ξ) ρ1) i)).
|
||
Proof. eauto using renaming. Qed.
|
||
|
||
Lemma morphing_ext n m (ρ0 ρ1 : fin n -> PTm m) a b :
|
||
R a b ->
|
||
(forall i, R (ρ0 i) (ρ1 i)) ->
|
||
(forall i, R ((scons a ρ0) i) ((scons b ρ1) i)).
|
||
Proof. hauto q:on inv:option. Qed.
|
||
|
||
Lemma morphing_up n m (ρ0 ρ1 : fin n -> PTm m) :
|
||
(forall i, R (ρ0 i) (ρ1 i)) ->
|
||
(forall i, R (up_PTm_PTm ρ0 i) (up_PTm_PTm ρ1 i)).
|
||
Proof. hauto l:on ctrs:R use:morphing_ext, morphing_ren unfold:up_PTm_PTm. Qed.
|
||
|
||
Lemma morphing n m (a b : PTm n) (ρ0 ρ1 : fin n -> PTm m) :
|
||
(forall i, R (ρ0 i) (ρ1 i)) ->
|
||
R a b -> R (subst_PTm ρ0 a) (subst_PTm ρ1 b).
|
||
Proof.
|
||
move => + h. move : m ρ0 ρ1.
|
||
elim : n a b /h.
|
||
- move => *.
|
||
apply : AppAbs'; eauto using morphing_up.
|
||
by asimpl.
|
||
- hauto lq:on ctrs:R.
|
||
- hauto lq:on ctrs:R use:morphing_up.
|
||
- hauto lq:on ctrs:R use:ProjPair' use:morphing_up.
|
||
- hauto lq:on ctrs:R use:morphing_up.
|
||
- hauto lq:on ctrs:R use:morphing_up.
|
||
- hauto lq:on ctrs:R use:morphing_up.
|
||
- hauto lq:on ctrs:R.
|
||
- hauto lq:on ctrs:R.
|
||
- hauto lq:on ctrs:R use:morphing_up.
|
||
- hauto lq:on ctrs:R.
|
||
- hauto lq:on ctrs:R.
|
||
Qed.
|
||
|
||
Lemma substing n m (a b : PTm n) (ρ : fin n -> PTm m) :
|
||
R a b ->
|
||
R (subst_PTm ρ a) (subst_PTm ρ b).
|
||
Proof. hauto l:on use:morphing, refl. Qed.
|
||
|
||
Lemma cong n (a b : PTm (S n)) c d :
|
||
R a b ->
|
||
R c d ->
|
||
R (subst_PTm (scons c VarPTm) a) (subst_PTm (scons d VarPTm) b).
|
||
Proof.
|
||
move => h0 h1. apply morphing => //=.
|
||
qauto l:on ctrs:R inv:option.
|
||
Qed.
|
||
|
||
Lemma var_or_const_imp {n} (a b : PTm n) :
|
||
var_or_const a ->
|
||
a = b -> ~~ var_or_const b -> False.
|
||
Proof.
|
||
hauto lq:on inv:PTm.
|
||
Qed.
|
||
|
||
Lemma var_or_const_up n m (ρ : fin n -> PTm m) :
|
||
(forall i, var_or_const (ρ i)) ->
|
||
(forall i, var_or_const (up_PTm_PTm ρ i)).
|
||
Proof.
|
||
move => h /= [i|].
|
||
- asimpl.
|
||
move /(_ i) in h.
|
||
rewrite /funcomp.
|
||
move : (ρ i) h.
|
||
case => //=.
|
||
- sfirstorder.
|
||
Qed.
|
||
|
||
Local Ltac antiimp := qauto l:on use:var_or_const_imp.
|
||
|
||
Lemma antirenaming n m (a : PTm n) (b : PTm m) (ρ : fin n -> PTm m) :
|
||
(forall i, var_or_const (ρ i)) ->
|
||
R (subst_PTm ρ a) b -> exists b0, R a b0 /\ subst_PTm ρ b0 = b.
|
||
Proof.
|
||
move E : (subst_PTm ρ a) => u hρ h.
|
||
move : n ρ hρ a E. elim : m u b/h.
|
||
- move => n a0 a1 b0 b1 ha iha hb ihb m ρ hρ []//=;
|
||
first by antiimp.
|
||
move => c c0 [+ ?]. subst.
|
||
case : c => //=; first by antiimp.
|
||
move => c [?]. subst.
|
||
spec_refl.
|
||
have /var_or_const_up hρ' := hρ.
|
||
move : iha hρ' => /[apply] iha.
|
||
move : ihb hρ => /[apply] ihb.
|
||
spec_refl.
|
||
move : iha => [c1][ih0]?. subst.
|
||
move : ihb => [c2][ih1]?. subst.
|
||
eexists. split.
|
||
apply AppAbs; eauto.
|
||
by asimpl.
|
||
- move => n a0 a1 b0 b1 c0 c1 ha iha hb ihb hc ihc m ρ hρ.
|
||
move => []//=;
|
||
first by antiimp.
|
||
move => []//=; first by antiimp.
|
||
move => t t0 t1 [*]. subst.
|
||
have {}/iha := hρ => iha.
|
||
have {}/ihb := hρ => ihb.
|
||
have {}/ihc := hρ => ihc.
|
||
spec_refl.
|
||
move : iha => [? [*]].
|
||
move : ihb => [? [*]].
|
||
move : ihc => [? [*]].
|
||
eexists. split.
|
||
apply AppPair; hauto. subst.
|
||
by asimpl.
|
||
- move => n p a0 a1 ha iha m ρ hρ []//=;
|
||
first by antiimp.
|
||
move => p0 []//= t [*]; first by antiimp. subst.
|
||
have /var_or_const_up {}/iha := hρ => iha.
|
||
spec_refl. move : iha => [b0 [? ?]]. subst.
|
||
eexists. split. apply ProjAbs; eauto. by asimpl.
|
||
- move => n p a0 a1 b0 b1 ha iha hb ihb m ρ hρ []//=;
|
||
first by antiimp.
|
||
move => p0 []//=; first by antiimp. move => t t0[*].
|
||
subst.
|
||
have {}/iha := (hρ) => iha.
|
||
have {}/ihb := (hρ) => ihb.
|
||
spec_refl.
|
||
move : iha => [b0 [? ?]].
|
||
move : ihb => [c0 [? ?]]. subst.
|
||
eexists. split. by eauto using ProjPair.
|
||
hauto q:on.
|
||
- move => n i m ρ hρ []//=.
|
||
hauto l:on.
|
||
- move => n a0 a1 ha iha m ρ hρ []//=; first by antiimp.
|
||
move => t [*]. subst.
|
||
have /var_or_const_up {}/iha := hρ => iha.
|
||
spec_refl.
|
||
move :iha => [b0 [? ?]]. subst.
|
||
eexists. split. by apply AbsCong; eauto.
|
||
by asimpl.
|
||
- move => n a0 a1 b0 b1 ha iha hb ihb m ρ hρ []//=;
|
||
first by antiimp.
|
||
move => t t0 [*]. subst.
|
||
have {}/iha := (hρ) => iha.
|
||
have {}/ihb := (hρ) => ihb.
|
||
spec_refl.
|
||
move : iha => [b0 [? ?]]. subst.
|
||
move : ihb => [c0 [? ?]]. subst.
|
||
eexists. split. by apply AppCong; eauto.
|
||
done.
|
||
- move => n a0 a1 b0 b1 ha iha hb ihb m ρ hρ []//=;
|
||
first by antiimp.
|
||
move => t t0[*]. subst.
|
||
have {}/iha := (hρ) => iha.
|
||
have {}/ihb := (hρ) => ihb.
|
||
spec_refl.
|
||
move : iha => [b0 [? ?]]. subst.
|
||
move : ihb => [c0 [? ?]]. subst.
|
||
eexists. split. by apply PairCong; eauto.
|
||
by asimpl.
|
||
- move => n p a0 a1 ha iha m ρ hρ []//=;
|
||
first by antiimp.
|
||
move => p0 t [*]. subst.
|
||
have {}/iha := (hρ) => iha.
|
||
spec_refl.
|
||
move : iha => [b0 [? ?]]. subst.
|
||
eexists. split. apply ProjCong; eauto. reflexivity.
|
||
- hauto q:on ctrs:R inv:PTm.
|
||
- hauto q:on ctrs:R inv:PTm.
|
||
- hauto q:on ctrs:R inv:PTm.
|
||
Qed.
|
||
End RPar.
|
||
|
||
(***************** Beta rules only ***********************)
|
||
Module RPar'.
|
||
Inductive R {n} : PTm n -> PTm n -> Prop :=
|
||
(***************** Beta ***********************)
|
||
| AppAbs a0 a1 b0 b1 :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PApp (PAbs a0) b0) (subst_PTm (scons b1 VarPTm) a1)
|
||
| ProjPair p a0 a1 b0 b1 :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PProj p (PPair a0 b0)) (if p is PL then a1 else b1)
|
||
|
||
|
||
(*************** Congruence ********************)
|
||
| Var i : R (VarPTm i) (VarPTm i)
|
||
| AbsCong a0 a1 :
|
||
R a0 a1 ->
|
||
R (PAbs a0) (PAbs a1)
|
||
| AppCong a0 a1 b0 b1 :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PApp a0 b0) (PApp a1 b1)
|
||
| PairCong a0 a1 b0 b1 :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PPair a0 b0) (PPair a1 b1)
|
||
| ProjCong p a0 a1 :
|
||
R a0 a1 ->
|
||
R (PProj p a0) (PProj p a1)
|
||
| ConstCong k :
|
||
R (PConst k) (PConst k)
|
||
| UnivCong i :
|
||
R (PUniv i) (PUniv i)
|
||
| BotCong :
|
||
R PBot PBot.
|
||
|
||
Derive Dependent Inversion inv with (forall n (a b : PTm n), R a b) Sort Prop.
|
||
|
||
Lemma refl n (a : PTm n) : R a a.
|
||
Proof.
|
||
induction a; hauto lq:on ctrs:R.
|
||
Qed.
|
||
|
||
Lemma AppAbs' n a0 a1 (b0 b1 t : PTm n) :
|
||
t = subst_PTm (scons b1 VarPTm) a1 ->
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PApp (PAbs a0) b0) t.
|
||
Proof. move => ->. apply AppAbs. Qed.
|
||
|
||
Lemma ProjPair' n p (a0 a1 b0 b1 : PTm n) t :
|
||
t = (if p is PL then a1 else b1) ->
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PProj p (PPair a0 b0)) t.
|
||
Proof. move => > ->. apply ProjPair. Qed.
|
||
|
||
Lemma renaming n m (a b : PTm n) (ξ : fin n -> fin m) :
|
||
R a b -> R (ren_PTm ξ a) (ren_PTm ξ b).
|
||
Proof.
|
||
move => h. move : m ξ.
|
||
elim : n a b /h.
|
||
move => *; apply : AppAbs'; eauto; by asimpl.
|
||
all : qauto ctrs:R use:ProjPair'.
|
||
Qed.
|
||
|
||
Lemma morphing_ren n m p (ρ0 ρ1 : fin n -> PTm m) (ξ : fin m -> fin p) :
|
||
(forall i, R (ρ0 i) (ρ1 i)) ->
|
||
(forall i, R ((funcomp (ren_PTm ξ) ρ0) i) ((funcomp (ren_PTm ξ) ρ1) i)).
|
||
Proof. eauto using renaming. Qed.
|
||
|
||
Lemma morphing_ext n m (ρ0 ρ1 : fin n -> PTm m) a b :
|
||
R a b ->
|
||
(forall i, R (ρ0 i) (ρ1 i)) ->
|
||
(forall i, R ((scons a ρ0) i) ((scons b ρ1) i)).
|
||
Proof. hauto q:on inv:option. Qed.
|
||
|
||
Lemma morphing_up n m (ρ0 ρ1 : fin n -> PTm m) :
|
||
(forall i, R (ρ0 i) (ρ1 i)) ->
|
||
(forall i, R (up_PTm_PTm ρ0 i) (up_PTm_PTm ρ1 i)).
|
||
Proof. hauto l:on ctrs:R use:morphing_ext, morphing_ren unfold:up_PTm_PTm. Qed.
|
||
|
||
Lemma morphing n m (a b : PTm n) (ρ0 ρ1 : fin n -> PTm m) :
|
||
(forall i, R (ρ0 i) (ρ1 i)) ->
|
||
R a b -> R (subst_PTm ρ0 a) (subst_PTm ρ1 b).
|
||
Proof.
|
||
move => + h. move : m ρ0 ρ1.
|
||
elim : n a b /h.
|
||
- move => *.
|
||
apply : AppAbs'; eauto using morphing_up.
|
||
by asimpl.
|
||
- hauto lq:on ctrs:R use:ProjPair' use:morphing_up.
|
||
- hauto lq:on ctrs:R use:morphing_up.
|
||
- hauto lq:on ctrs:R use:morphing_up.
|
||
- hauto lq:on ctrs:R use:morphing_up.
|
||
- hauto lq:on ctrs:R.
|
||
- hauto lq:on ctrs:R.
|
||
- hauto l:on ctrs:R use:morphing_up.
|
||
- hauto lq:on ctrs:R.
|
||
- hauto lq:on ctrs:R.
|
||
Qed.
|
||
|
||
Lemma substing n m (a b : PTm n) (ρ : fin n -> PTm m) :
|
||
R a b ->
|
||
R (subst_PTm ρ a) (subst_PTm ρ b).
|
||
Proof. hauto l:on use:morphing, refl. Qed.
|
||
|
||
Lemma cong n (a b : PTm (S n)) c d :
|
||
R a b ->
|
||
R c d ->
|
||
R (subst_PTm (scons c VarPTm) a) (subst_PTm (scons d VarPTm) b).
|
||
Proof.
|
||
move => h0 h1. apply morphing => //=.
|
||
qauto l:on ctrs:R inv:option.
|
||
Qed.
|
||
|
||
Lemma var_or_const_imp {n} (a b : PTm n) :
|
||
var_or_const a ->
|
||
a = b -> ~~ var_or_const b -> False.
|
||
Proof.
|
||
hauto lq:on inv:PTm.
|
||
Qed.
|
||
|
||
Lemma var_or_const_up n m (ρ : fin n -> PTm m) :
|
||
(forall i, var_or_const (ρ i)) ->
|
||
(forall i, var_or_const (up_PTm_PTm ρ i)).
|
||
Proof.
|
||
move => h /= [i|].
|
||
- asimpl.
|
||
move /(_ i) in h.
|
||
rewrite /funcomp.
|
||
move : (ρ i) h.
|
||
case => //=.
|
||
- sfirstorder.
|
||
Qed.
|
||
|
||
Local Ltac antiimp := qauto l:on use:var_or_const_imp.
|
||
|
||
Lemma antirenaming n m (a : PTm n) (b : PTm m) (ρ : fin n -> PTm m) :
|
||
(forall i, var_or_const (ρ i)) ->
|
||
R (subst_PTm ρ a) b -> exists b0, R a b0 /\ subst_PTm ρ b0 = b.
|
||
Proof.
|
||
move E : (subst_PTm ρ a) => u hρ h.
|
||
move : n ρ hρ a E. elim : m u b/h.
|
||
- move => n a0 a1 b0 b1 ha iha hb ihb m ρ hρ []//=;
|
||
first by antiimp.
|
||
move => c c0 [+ ?]. subst.
|
||
case : c => //=; first by antiimp.
|
||
move => c [?]. subst.
|
||
spec_refl.
|
||
have /var_or_const_up hρ' := hρ.
|
||
move : iha hρ' => /[apply] iha.
|
||
move : ihb hρ => /[apply] ihb.
|
||
spec_refl.
|
||
move : iha => [c1][ih0]?. subst.
|
||
move : ihb => [c2][ih1]?. subst.
|
||
eexists. split.
|
||
apply AppAbs; eauto.
|
||
by asimpl.
|
||
- move => n p a0 a1 b0 b1 ha iha hb ihb m ρ hρ []//=;
|
||
first by antiimp.
|
||
move => p0 []//=; first by antiimp. move => t t0[*].
|
||
subst.
|
||
have {}/iha := (hρ) => iha.
|
||
have {}/ihb := (hρ) => ihb.
|
||
spec_refl.
|
||
move : iha => [b0 [? ?]].
|
||
move : ihb => [c0 [? ?]]. subst.
|
||
eexists. split. by eauto using ProjPair.
|
||
hauto q:on.
|
||
- move => n i m ρ hρ []//=.
|
||
hauto l:on.
|
||
- move => n a0 a1 ha iha m ρ hρ []//=; first by antiimp.
|
||
move => t [*]. subst.
|
||
have /var_or_const_up {}/iha := hρ => iha.
|
||
spec_refl.
|
||
move :iha => [b0 [? ?]]. subst.
|
||
eexists. split. by apply AbsCong; eauto.
|
||
by asimpl.
|
||
- move => n a0 a1 b0 b1 ha iha hb ihb m ρ hρ []//=;
|
||
first by antiimp.
|
||
move => t t0 [*]. subst.
|
||
have {}/iha := (hρ) => iha.
|
||
have {}/ihb := (hρ) => ihb.
|
||
spec_refl.
|
||
move : iha => [b0 [? ?]]. subst.
|
||
move : ihb => [c0 [? ?]]. subst.
|
||
eexists. split. by apply AppCong; eauto.
|
||
done.
|
||
- move => n a0 a1 b0 b1 ha iha hb ihb m ρ hρ []//=;
|
||
first by antiimp.
|
||
move => t t0[*]. subst.
|
||
have {}/iha := (hρ) => iha.
|
||
have {}/ihb := (hρ) => ihb.
|
||
spec_refl.
|
||
move : iha => [b0 [? ?]]. subst.
|
||
move : ihb => [c0 [? ?]]. subst.
|
||
eexists. split. by apply PairCong; eauto.
|
||
by asimpl.
|
||
- move => n p a0 a1 ha iha m ρ hρ []//=;
|
||
first by antiimp.
|
||
move => p0 t [*]. subst.
|
||
have {}/iha := (hρ) => iha.
|
||
spec_refl.
|
||
move : iha => [b0 [? ?]]. subst.
|
||
eexists. split. apply ProjCong; eauto. reflexivity.
|
||
- hauto q:on ctrs:R inv:PTm.
|
||
- move => n i n0 ρ hρ []//=; first by antiimp.
|
||
hauto l:on.
|
||
- hauto q:on inv:PTm ctrs:R.
|
||
Qed.
|
||
End RPar'.
|
||
|
||
|
||
Module EReds.
|
||
|
||
#[local]Ltac solve_s_rec :=
|
||
move => *; eapply rtc_l; eauto;
|
||
hauto lq:on ctrs:ERed.R.
|
||
|
||
#[local]Ltac solve_s :=
|
||
repeat (induction 1; last by solve_s_rec); apply rtc_refl.
|
||
|
||
Lemma AbsCong n (a b : PTm (S n)) :
|
||
rtc ERed.R a b ->
|
||
rtc ERed.R (PAbs a) (PAbs b).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma AppCong n (a0 a1 b0 b1 : PTm n) :
|
||
rtc ERed.R a0 a1 ->
|
||
rtc ERed.R b0 b1 ->
|
||
rtc ERed.R (PApp a0 b0) (PApp a1 b1).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma PairCong n (a0 a1 b0 b1 : PTm n) :
|
||
rtc ERed.R a0 a1 ->
|
||
rtc ERed.R b0 b1 ->
|
||
rtc ERed.R (PPair a0 b0) (PPair a1 b1).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma ProjCong n p (a0 a1 : PTm n) :
|
||
rtc ERed.R a0 a1 ->
|
||
rtc ERed.R (PProj p a0) (PProj p a1).
|
||
Proof. solve_s. Qed.
|
||
End EReds.
|
||
|
||
Module EPar.
|
||
Inductive R {n} : PTm n -> PTm n -> Prop :=
|
||
(****************** Eta ***********************)
|
||
| AppEta a0 a1 :
|
||
R a0 a1 ->
|
||
R a0 (PAbs (PApp (ren_PTm shift a1) (VarPTm var_zero)))
|
||
| PairEta a0 a1 :
|
||
R a0 a1 ->
|
||
R a0 (PPair (PProj PL a1) (PProj PR a1))
|
||
|
||
(*************** Congruence ********************)
|
||
| Var i : R (VarPTm i) (VarPTm i)
|
||
| AbsCong a0 a1 :
|
||
R a0 a1 ->
|
||
R (PAbs a0) (PAbs a1)
|
||
| AppCong a0 a1 b0 b1 :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PApp a0 b0) (PApp a1 b1)
|
||
| PairCong a0 a1 b0 b1 :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (PPair a0 b0) (PPair a1 b1)
|
||
| ProjCong p a0 a1 :
|
||
R a0 a1 ->
|
||
R (PProj p a0) (PProj p a1)
|
||
| ConstCong k :
|
||
R (PConst k) (PConst k)
|
||
| UnivCong i :
|
||
R (PUniv i) (PUniv i)
|
||
| BotCong :
|
||
R PBot PBot.
|
||
|
||
Lemma refl n (a : PTm n) : EPar.R a a.
|
||
Proof.
|
||
induction a; hauto lq:on ctrs:EPar.R.
|
||
Qed.
|
||
|
||
Lemma renaming n m (a b : PTm n) (ξ : fin n -> fin m) :
|
||
R a b -> R (ren_PTm ξ a) (ren_PTm ξ b).
|
||
Proof.
|
||
move => h. move : m ξ.
|
||
elim : n a b /h.
|
||
|
||
move => n a0 a1 ha iha m ξ /=.
|
||
move /(_ _ ξ) /AppEta : iha.
|
||
by asimpl.
|
||
|
||
all : qauto ctrs:R.
|
||
Qed.
|
||
|
||
Derive Dependent Inversion inv with (forall n (a b : PTm n), R a b) Sort Prop.
|
||
|
||
Lemma AppEta' n (a0 a1 b : PTm n) :
|
||
b = (PAbs (PApp (ren_PTm shift a1) (VarPTm var_zero))) ->
|
||
R a0 a1 ->
|
||
R a0 b.
|
||
Proof. move => ->; apply AppEta. Qed.
|
||
|
||
Lemma morphing n m (a b : PTm n) (ρ0 ρ1 : fin n -> PTm m) :
|
||
R a b ->
|
||
(forall i, R (ρ0 i) (ρ1 i)) ->
|
||
R (subst_PTm ρ0 a) (subst_PTm ρ1 b).
|
||
Proof.
|
||
move => h. move : m ρ0 ρ1. elim : n a b / h => n.
|
||
- move => a0 a1 ha iha m ρ0 ρ1 hρ /=.
|
||
apply : AppEta'; eauto. by asimpl.
|
||
- hauto lq:on ctrs:R.
|
||
- hauto lq:on ctrs:R.
|
||
- hauto l:on ctrs:R use:renaming inv:option.
|
||
- hauto q:on ctrs:R.
|
||
- hauto q:on ctrs:R.
|
||
- hauto q:on ctrs:R.
|
||
- hauto l:on ctrs:R use:renaming inv:option.
|
||
- hauto lq:on ctrs:R.
|
||
- hauto lq:on ctrs:R.
|
||
Qed.
|
||
|
||
Lemma substing n a0 a1 (b0 b1 : PTm n) :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
R (subst_PTm (scons b0 VarPTm) a0) (subst_PTm (scons b1 VarPTm) a1).
|
||
Proof.
|
||
move => h0 h1. apply morphing => //.
|
||
hauto lq:on ctrs:R inv:option.
|
||
Qed.
|
||
|
||
End EPar.
|
||
|
||
|
||
Module OExp.
|
||
Inductive R {n} : PTm n -> PTm n -> Prop :=
|
||
(****************** Eta ***********************)
|
||
| AppEta a :
|
||
R a (PAbs (PApp (ren_PTm shift a) (VarPTm var_zero)))
|
||
| PairEta a :
|
||
R a (PPair (PProj PL a) (PProj PR a)).
|
||
|
||
Lemma merge n (t a b : PTm n) :
|
||
rtc R a b ->
|
||
EPar.R t a ->
|
||
EPar.R t b.
|
||
Proof.
|
||
move => h. move : t. elim : a b /h.
|
||
- eauto using EPar.refl.
|
||
- hauto q:on ctrs:EPar.R inv:R.
|
||
Qed.
|
||
|
||
Lemma commutativity n (a b c : PTm n) :
|
||
EPar.R a b -> R a c -> exists d, R b d /\ EPar.R c d.
|
||
Proof.
|
||
move => h.
|
||
inversion 1; subst.
|
||
- hauto q:on ctrs:EPar.R, R use:EPar.renaming, EPar.refl.
|
||
- hauto lq:on ctrs:EPar.R, R.
|
||
Qed.
|
||
|
||
Lemma commutativity0 n (a b c : PTm n) :
|
||
EPar.R a b -> rtc R a c -> exists d, rtc R b d /\ EPar.R c d.
|
||
Proof.
|
||
move => + h. move : b.
|
||
elim : a c / h.
|
||
- sfirstorder.
|
||
- hauto lq:on rew:off ctrs:rtc use:commutativity.
|
||
Qed.
|
||
|
||
End OExp.
|
||
|
||
|
||
Local Ltac com_helper :=
|
||
split; [hauto lq:on ctrs:RPar.R use: RPar.refl, RPar.renaming
|
||
|hauto lq:on ctrs:EPar.R use:EPar.refl, EPar.renaming].
|
||
|
||
Module RPars.
|
||
|
||
#[local]Ltac solve_s_rec :=
|
||
move => *; eapply rtc_l; eauto;
|
||
hauto lq:on ctrs:RPar.R use:RPar.refl.
|
||
|
||
#[local]Ltac solve_s :=
|
||
repeat (induction 1; last by solve_s_rec); apply rtc_refl.
|
||
|
||
Lemma AbsCong n (a b : PTm (S n)) :
|
||
rtc RPar.R a b ->
|
||
rtc RPar.R (PAbs a) (PAbs b).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma AppCong n (a0 a1 b0 b1 : PTm n) :
|
||
rtc RPar.R a0 a1 ->
|
||
rtc RPar.R b0 b1 ->
|
||
rtc RPar.R (PApp a0 b0) (PApp a1 b1).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma PairCong n (a0 a1 b0 b1 : PTm n) :
|
||
rtc RPar.R a0 a1 ->
|
||
rtc RPar.R b0 b1 ->
|
||
rtc RPar.R (PPair a0 b0) (PPair a1 b1).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma ProjCong n p (a0 a1 : PTm n) :
|
||
rtc RPar.R a0 a1 ->
|
||
rtc RPar.R (PProj p a0) (PProj p a1).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma renaming n (a0 a1 : PTm n) m (ξ : fin n -> fin m) :
|
||
rtc RPar.R a0 a1 ->
|
||
rtc RPar.R (ren_PTm ξ a0) (ren_PTm ξ a1).
|
||
Proof.
|
||
induction 1.
|
||
- apply rtc_refl.
|
||
- eauto using RPar.renaming, rtc_l.
|
||
Qed.
|
||
|
||
Lemma weakening n (a0 a1 : PTm n) :
|
||
rtc RPar.R a0 a1 ->
|
||
rtc RPar.R (ren_PTm shift a0) (ren_PTm shift a1).
|
||
Proof. apply renaming. Qed.
|
||
|
||
Lemma Abs_inv n (a : PTm (S n)) b :
|
||
rtc RPar.R (PAbs a) b -> exists a', b = PAbs a' /\ rtc RPar.R a a'.
|
||
Proof.
|
||
move E : (PAbs a) => b0 h. move : a E.
|
||
elim : b0 b / h.
|
||
- hauto lq:on ctrs:rtc.
|
||
- hauto lq:on ctrs:rtc inv:RPar.R, rtc.
|
||
Qed.
|
||
|
||
Lemma morphing n m (a b : PTm n) (ρ : fin n -> PTm m) :
|
||
rtc RPar.R a b ->
|
||
rtc RPar.R (subst_PTm ρ a) (subst_PTm ρ b).
|
||
Proof. induction 1; qauto l:on ctrs:rtc use:RPar.substing. Qed.
|
||
|
||
Lemma substing n (a b : PTm (S n)) c :
|
||
rtc RPar.R a b ->
|
||
rtc RPar.R (subst_PTm (scons c VarPTm) a) (subst_PTm (scons c VarPTm) b).
|
||
Proof. hauto lq:on use:morphing inv:option. Qed.
|
||
|
||
Lemma antirenaming n m (a : PTm n) (b : PTm m) (ρ : fin n -> PTm m) :
|
||
(forall i, var_or_const (ρ i)) ->
|
||
rtc RPar.R (subst_PTm ρ a) b -> exists b0, rtc RPar.R a b0 /\ subst_PTm ρ b0 = b.
|
||
Proof.
|
||
move E :(subst_PTm ρ a) => u hρ h.
|
||
move : a E.
|
||
elim : u b /h.
|
||
- sfirstorder.
|
||
- move => a b c h0 h1 ih1 a0 ?. subst.
|
||
move /RPar.antirenaming : h0.
|
||
move /(_ hρ).
|
||
move => [b0 [h2 ?]]. subst.
|
||
hauto lq:on rew:off ctrs:rtc.
|
||
Qed.
|
||
|
||
End RPars.
|
||
|
||
Module RPars'.
|
||
|
||
#[local]Ltac solve_s_rec :=
|
||
move => *; eapply rtc_l; eauto;
|
||
hauto lq:on ctrs:RPar'.R use:RPar'.refl.
|
||
|
||
#[local]Ltac solve_s :=
|
||
repeat (induction 1; last by solve_s_rec); apply rtc_refl.
|
||
|
||
Lemma AbsCong n (a b : PTm (S n)) :
|
||
rtc RPar'.R a b ->
|
||
rtc RPar'.R (PAbs a) (PAbs b).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma AppCong n (a0 a1 b0 b1 : PTm n) :
|
||
rtc RPar'.R a0 a1 ->
|
||
rtc RPar'.R b0 b1 ->
|
||
rtc RPar'.R (PApp a0 b0) (PApp a1 b1).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma PairCong n (a0 a1 b0 b1 : PTm n) :
|
||
rtc RPar'.R a0 a1 ->
|
||
rtc RPar'.R b0 b1 ->
|
||
rtc RPar'.R (PPair a0 b0) (PPair a1 b1).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma ProjCong n p (a0 a1 : PTm n) :
|
||
rtc RPar'.R a0 a1 ->
|
||
rtc RPar'.R (PProj p a0) (PProj p a1).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma renaming n (a0 a1 : PTm n) m (ξ : fin n -> fin m) :
|
||
rtc RPar'.R a0 a1 ->
|
||
rtc RPar'.R (ren_PTm ξ a0) (ren_PTm ξ a1).
|
||
Proof.
|
||
induction 1.
|
||
- apply rtc_refl.
|
||
- eauto using RPar'.renaming, rtc_l.
|
||
Qed.
|
||
|
||
Lemma weakening n (a0 a1 : PTm n) :
|
||
rtc RPar'.R a0 a1 ->
|
||
rtc RPar'.R (ren_PTm shift a0) (ren_PTm shift a1).
|
||
Proof. apply renaming. Qed.
|
||
|
||
Lemma Abs_inv n (a : PTm (S n)) b :
|
||
rtc RPar'.R (PAbs a) b -> exists a', b = PAbs a' /\ rtc RPar'.R a a'.
|
||
Proof.
|
||
move E : (PAbs a) => b0 h. move : a E.
|
||
elim : b0 b / h.
|
||
- hauto lq:on ctrs:rtc.
|
||
- hauto lq:on ctrs:rtc inv:RPar'.R, rtc.
|
||
Qed.
|
||
|
||
Lemma morphing n m (a b : PTm n) (ρ : fin n -> PTm m) :
|
||
rtc RPar'.R a b ->
|
||
rtc RPar'.R (subst_PTm ρ a) (subst_PTm ρ b).
|
||
Proof. induction 1; qauto l:on ctrs:rtc use:RPar'.substing. Qed.
|
||
|
||
Lemma substing n (a b : PTm (S n)) c :
|
||
rtc RPar'.R a b ->
|
||
rtc RPar'.R (subst_PTm (scons c VarPTm) a) (subst_PTm (scons c VarPTm) b).
|
||
Proof. hauto lq:on use:morphing inv:option. Qed.
|
||
|
||
Lemma antirenaming n m (a : PTm n) (b : PTm m) (ρ : fin n -> PTm m) :
|
||
(forall i, var_or_const (ρ i)) ->
|
||
rtc RPar'.R (subst_PTm ρ a) b -> exists b0, rtc RPar'.R a b0 /\ subst_PTm ρ b0 = b.
|
||
Proof.
|
||
move E :(subst_PTm ρ a) => u hρ h.
|
||
move : a E.
|
||
elim : u b /h.
|
||
- sfirstorder.
|
||
- move => a b c h0 h1 ih1 a0 ?. subst.
|
||
move /RPar'.antirenaming : h0.
|
||
move /(_ hρ).
|
||
move => [b0 [h2 ?]]. subst.
|
||
hauto lq:on rew:off ctrs:rtc.
|
||
Qed.
|
||
|
||
End RPars'.
|
||
|
||
Lemma Abs_EPar n a (b : PTm n) :
|
||
EPar.R (PAbs a) b ->
|
||
(exists d, EPar.R a d /\
|
||
rtc RPar.R (PApp (ren_PTm shift b) (VarPTm var_zero)) d) /\
|
||
(exists d,
|
||
EPar.R a d /\ forall p,
|
||
rtc RPar.R (PProj p b) (PAbs (PProj p d))).
|
||
Proof.
|
||
move E : (PAbs a) => u h.
|
||
move : a E.
|
||
elim : n u b /h => //=.
|
||
- move => n a0 a1 ha iha b ?. subst.
|
||
specialize iha with (1 := eq_refl).
|
||
move : iha => [[d [ih0 ih1]] _].
|
||
split; exists d.
|
||
+ split => //.
|
||
apply : rtc_l.
|
||
apply RPar.AppAbs; eauto => //=.
|
||
apply RPar.refl.
|
||
by apply RPar.refl.
|
||
move :ih1; substify; by asimpl.
|
||
+ split => // p.
|
||
apply : rtc_l.
|
||
apply : RPar.ProjAbs.
|
||
by apply RPar.refl.
|
||
eauto using RPars.ProjCong, RPars.AbsCong.
|
||
- move => n ? a1 ha iha a0 ?. subst. specialize iha with (1 := eq_refl).
|
||
move : iha => [_ [d [ih0 ih1]]].
|
||
split.
|
||
+ exists (PPair (PProj PL d) (PProj PR d)).
|
||
split; first by apply EPar.PairEta.
|
||
apply : rtc_l.
|
||
apply RPar.AppPair; eauto using RPar.refl.
|
||
suff h : forall p, rtc RPar.R (PApp (PProj p (ren_PTm shift a1)) (VarPTm var_zero)) (PProj p d) by
|
||
sfirstorder use:RPars.PairCong.
|
||
move => p. move /(_ p) /RPars.weakening in ih1.
|
||
apply relations.rtc_transitive with (y := PApp (ren_PTm shift (PAbs (PProj p d))) (VarPTm var_zero)).
|
||
by eauto using RPars.AppCong, rtc_refl.
|
||
apply relations.rtc_once => /=.
|
||
apply : RPar.AppAbs'; eauto using RPar.refl.
|
||
by asimpl.
|
||
+ exists d. repeat split => //. move => p.
|
||
apply : rtc_l; eauto.
|
||
hauto q:on use:RPar.ProjPair', RPar.refl.
|
||
- move => n a0 a1 ha _ ? [*]. subst.
|
||
split.
|
||
+ exists a1. split => //.
|
||
apply rtc_once. apply : RPar.AppAbs'; eauto using RPar.refl. by asimpl.
|
||
+ exists a1. split => // p.
|
||
apply rtc_once. apply : RPar.ProjAbs; eauto using RPar.refl.
|
||
Qed.
|
||
|
||
Lemma Pair_EPar n (a b c : PTm n) :
|
||
EPar.R (PPair a b) c ->
|
||
(forall p, exists d, rtc RPar.R (PProj p c) d /\ EPar.R (if p is PL then a else b) d) /\
|
||
(exists d0 d1, rtc RPar.R (PApp (ren_PTm shift c) (VarPTm var_zero))
|
||
(PPair (PApp (ren_PTm shift d0) (VarPTm var_zero))(PApp (ren_PTm shift d1) (VarPTm var_zero))) /\
|
||
EPar.R a d0 /\ EPar.R b d1).
|
||
Proof.
|
||
move E : (PPair a b) => u h. move : a b E.
|
||
elim : n u c /h => //=.
|
||
- move => n a0 a1 ha iha a b ?. subst.
|
||
specialize iha with (1 := eq_refl).
|
||
move : iha => [_ [d0 [d1 [ih0 [ih1 ih2]]]]].
|
||
split.
|
||
+ move => p.
|
||
exists (PAbs (PApp (ren_PTm shift (if p is PL then d0 else d1)) (VarPTm var_zero))).
|
||
split.
|
||
* apply : relations.rtc_transitive.
|
||
** apply RPars.ProjCong. apply RPars.AbsCong. eassumption.
|
||
** apply : rtc_l. apply RPar.ProjAbs; eauto using RPar.refl. apply RPars.AbsCong.
|
||
apply : rtc_l. apply RPar.ProjPair; eauto using RPar.refl.
|
||
hauto l:on.
|
||
* hauto lq:on use:EPar.AppEta'.
|
||
+ exists d0, d1.
|
||
repeat split => //.
|
||
apply : rtc_l. apply : RPar.AppAbs'; eauto using RPar.refl => //=.
|
||
by asimpl; renamify.
|
||
- move => n a0 a1 ha iha a b ?. subst. specialize iha with (1 := eq_refl).
|
||
split => [p|].
|
||
+ move : iha => [/(_ p) [d [ih0 ih1]] _].
|
||
exists d. split=>//.
|
||
apply : rtc_l. apply RPar.ProjPair; eauto using RPar.refl.
|
||
set q := (X in rtc RPar.R X d).
|
||
by have -> : q = PProj p a1 by hauto lq:on.
|
||
+ move :iha => [iha _].
|
||
move : (iha PL) => [d0 [ih0 ih0']].
|
||
move : (iha PR) => [d1 [ih1 ih1']] {iha}.
|
||
exists d0, d1.
|
||
apply RPars.weakening in ih0, ih1.
|
||
repeat split => //=.
|
||
apply : rtc_l. apply RPar.AppPair; eauto using RPar.refl.
|
||
apply RPars.PairCong; apply RPars.AppCong; eauto using rtc_refl.
|
||
- move => n a0 a1 b0 b1 ha _ hb _ a b [*]. subst.
|
||
split.
|
||
+ move => p.
|
||
exists (if p is PL then a1 else b1).
|
||
split.
|
||
* apply rtc_once. apply : RPar.ProjPair'; eauto using RPar.refl.
|
||
* hauto lq:on rew:off.
|
||
+ exists a1, b1.
|
||
split. apply rtc_once. apply RPar.AppPair; eauto using RPar.refl.
|
||
split => //.
|
||
Qed.
|
||
|
||
Lemma commutativity0 n (a b0 b1 : PTm n) :
|
||
EPar.R a b0 -> RPar.R a b1 -> exists c, rtc RPar.R b0 c /\ EPar.R b1 c.
|
||
Proof.
|
||
move => h. move : b1.
|
||
elim : n a b0 / h.
|
||
- move => n a b0 ha iha b1 hb.
|
||
move : iha (hb) => /[apply].
|
||
move => [c [ih0 ih1]].
|
||
exists (PAbs (PApp (ren_PTm shift c) (VarPTm var_zero))).
|
||
split.
|
||
+ hauto lq:on ctrs:rtc use:RPars.AbsCong, RPars.AppCong, RPars.renaming.
|
||
+ hauto lq:on ctrs:EPar.R use:EPar.refl, EPar.renaming.
|
||
- move => n a b0 hb0 ihb0 b1 /[dup] hb1 {}/ihb0.
|
||
move => [c [ih0 ih1]].
|
||
exists (PPair (PProj PL c) (PProj PR c)). split.
|
||
+ apply RPars.PairCong;
|
||
by apply RPars.ProjCong.
|
||
+ hauto lq:on ctrs:EPar.R use:EPar.refl, EPar.renaming.
|
||
- hauto l:on ctrs:rtc inv:RPar.R.
|
||
- move => n a0 a1 h ih b1.
|
||
elim /RPar.inv => //= _.
|
||
move => a2 a3 ? [*]. subst.
|
||
hauto lq:on ctrs:rtc, RPar.R, EPar.R use:RPars.AbsCong.
|
||
- move => n a0 a1 b0 b1 ha iha hb ihb b2.
|
||
elim /RPar.inv => //= _.
|
||
+ move => a2 a3 b3 b4 h0 h1 [*]. subst.
|
||
move /(_ _ ltac:(by eauto)) : ihb => [b [ihb0 ihb1]].
|
||
have {}/iha : RPar.R (PAbs a2) (PAbs a3) by hauto lq:on ctrs:RPar.R.
|
||
move => [c [ih0 /Abs_EPar [[d [ih1 ih2]] _]]].
|
||
exists (subst_PTm (scons b VarPTm) d).
|
||
split.
|
||
(* By substitution *)
|
||
* move /RPars.substing : ih2.
|
||
move /(_ b).
|
||
asimpl.
|
||
eauto using relations.rtc_transitive, RPars.AppCong.
|
||
(* By EPar morphing *)
|
||
* by apply EPar.substing.
|
||
+ move => a2 a3 b3 b4 c0 c1 h0 h1 h2 [*]. subst.
|
||
move /(_ _ ltac:(by eauto using RPar.PairCong)) : iha
|
||
=> [c [ihc0 ihc1]].
|
||
move /(_ _ ltac:(by eauto)) : ihb => [d [ihd0 ihd1]].
|
||
move /Pair_EPar : ihc1 => [_ [d0 [d1 [ih0 [ih1 ih2]]]]].
|
||
move /RPars.substing : ih0. move /(_ d).
|
||
asimpl => h.
|
||
exists (PPair (PApp d0 d) (PApp d1 d)).
|
||
split.
|
||
hauto lq:on use:relations.rtc_transitive, RPars.AppCong.
|
||
apply EPar.PairCong; by apply EPar.AppCong.
|
||
+ hauto lq:on ctrs:EPar.R use:RPars.AppCong.
|
||
- hauto lq:on ctrs:EPar.R inv:RPar.R use:RPars.PairCong.
|
||
- move => n p a b0 h0 ih0 b1.
|
||
elim /RPar.inv => //= _.
|
||
+ move => ? a0 a1 h [*]. subst.
|
||
move /(_ _ ltac:(by eauto using RPar.AbsCong)) : ih0 => [c [ih0 ih1]].
|
||
move /Abs_EPar : ih1 => [_ [d [ih1 ih2]]].
|
||
exists (PAbs (PProj p d)).
|
||
qauto l:on ctrs:EPar.R use:RPars.ProjCong, @relations.rtc_transitive.
|
||
+ move => p0 a0 a1 b2 b3 h1 h2 [*]. subst.
|
||
move /(_ _ ltac:(by eauto using RPar.PairCong)) : ih0 => [c [ih0 ih1]].
|
||
move /Pair_EPar : ih1 => [/(_ p)[d [ihd ihd']] _].
|
||
exists d. split => //.
|
||
hauto lq:on use:RPars.ProjCong, relations.rtc_transitive.
|
||
+ hauto lq:on ctrs:EPar.R use:RPars.ProjCong.
|
||
- hauto l:on ctrs:EPar.R inv:RPar.R.
|
||
- hauto l:on ctrs:EPar.R inv:RPar.R.
|
||
- hauto l:on ctrs:EPar.R inv:RPar.R.
|
||
Qed.
|
||
|
||
Lemma commutativity1 n (a b0 b1 : PTm n) :
|
||
EPar.R a b0 -> rtc RPar.R a b1 -> exists c, rtc RPar.R b0 c /\ EPar.R b1 c.
|
||
Proof.
|
||
move => + h. move : b0.
|
||
elim : a b1 / h.
|
||
- sfirstorder.
|
||
- qauto l:on use:relations.rtc_transitive, commutativity0.
|
||
Qed.
|
||
|
||
Lemma commutativity n (a b0 b1 : PTm n) :
|
||
rtc EPar.R a b0 -> rtc RPar.R a b1 -> exists c, rtc RPar.R b0 c /\ rtc EPar.R b1 c.
|
||
move => h. move : b1. elim : a b0 /h.
|
||
- sfirstorder.
|
||
- move => a0 a1 a2 + ha1 ih b1 +.
|
||
move : commutativity1; repeat move/[apply].
|
||
hauto q:on ctrs:rtc.
|
||
Qed.
|
||
|
||
Lemma Abs_EPar' n a (b : PTm n) :
|
||
EPar.R (PAbs a) b ->
|
||
(exists d, EPar.R a d /\
|
||
rtc OExp.R (PAbs d) b).
|
||
Proof.
|
||
move E : (PAbs a) => u h.
|
||
move : a E.
|
||
elim : n u b /h => //=.
|
||
- move => n a0 a1 ha iha a ?. subst.
|
||
specialize iha with (1 := eq_refl).
|
||
hauto lq:on ctrs:OExp.R use:rtc_r.
|
||
- move => n a0 a1 ha iha a ?. subst.
|
||
specialize iha with (1 := eq_refl).
|
||
hauto lq:on ctrs:OExp.R use:rtc_r.
|
||
- hauto l:on ctrs:OExp.R.
|
||
Qed.
|
||
|
||
Lemma Proj_EPar' n p a (b : PTm n) :
|
||
EPar.R (PProj p a) b ->
|
||
(exists d, EPar.R a d /\
|
||
rtc OExp.R (PProj p d) b).
|
||
Proof.
|
||
move E : (PProj p a) => u h.
|
||
move : p a E.
|
||
elim : n u b /h => //=.
|
||
- move => n a0 a1 ha iha a p ?. subst.
|
||
specialize iha with (1 := eq_refl).
|
||
hauto lq:on ctrs:OExp.R use:rtc_r.
|
||
- move => n a0 a1 ha iha a p ?. subst.
|
||
specialize iha with (1 := eq_refl).
|
||
hauto lq:on ctrs:OExp.R use:rtc_r.
|
||
- hauto l:on ctrs:OExp.R.
|
||
Qed.
|
||
|
||
Lemma App_EPar' n (a b u : PTm n) :
|
||
EPar.R (PApp a b) u ->
|
||
(exists a0 b0, EPar.R a a0 /\ EPar.R b b0 /\ rtc OExp.R (PApp a0 b0) u).
|
||
Proof.
|
||
move E : (PApp a b) => t h.
|
||
move : a b E. elim : n t u /h => //=.
|
||
- move => n a0 a1 ha iha a b ?. subst.
|
||
specialize iha with (1 := eq_refl).
|
||
hauto lq:on ctrs:OExp.R use:rtc_r.
|
||
- move => n a0 a1 ha iha a b ?. subst.
|
||
specialize iha with (1 := eq_refl).
|
||
hauto lq:on ctrs:OExp.R use:rtc_r.
|
||
- hauto l:on ctrs:OExp.R.
|
||
Qed.
|
||
|
||
Lemma Pair_EPar' n (a b u : PTm n) :
|
||
EPar.R (PPair a b) u ->
|
||
exists a0 b0, EPar.R a a0 /\ EPar.R b b0 /\ rtc OExp.R (PPair a0 b0) u.
|
||
Proof.
|
||
move E : (PPair a b) => t h.
|
||
move : a b E. elim : n t u /h => //=.
|
||
- move => n a0 a1 ha iha a b ?. subst.
|
||
specialize iha with (1 := eq_refl).
|
||
hauto lq:on ctrs:OExp.R use:rtc_r.
|
||
- move => n a0 a1 ha iha a b ?. subst.
|
||
specialize iha with (1 := eq_refl).
|
||
hauto lq:on ctrs:OExp.R use:rtc_r.
|
||
- hauto l:on ctrs:OExp.R.
|
||
Qed.
|
||
|
||
Lemma Const_EPar' n k (u : PTm n) :
|
||
EPar.R (PConst k) u ->
|
||
rtc OExp.R (PConst k) u.
|
||
move E : (PConst k) => t h.
|
||
move : k E. elim : n t u /h => //=.
|
||
- move => n a0 a1 h ih k ?. subst.
|
||
specialize ih with (1 := eq_refl).
|
||
hauto lq:on ctrs:OExp.R use:rtc_r.
|
||
- move => n a0 a1 h ih k ?. subst.
|
||
specialize ih with (1 := eq_refl).
|
||
hauto lq:on ctrs:OExp.R use:rtc_r.
|
||
- hauto l:on ctrs:OExp.R.
|
||
Qed.
|
||
|
||
Lemma Bot_EPar' n (u : PTm n) :
|
||
EPar.R (PBot) u ->
|
||
rtc OExp.R (PBot) u.
|
||
move E : (PBot) => t h.
|
||
move : E. elim : n t u /h => //=.
|
||
- move => n a0 a1 h ih ?. subst.
|
||
specialize ih with (1 := eq_refl).
|
||
hauto lq:on ctrs:OExp.R use:rtc_r.
|
||
- move => n a0 a1 h ih ?. subst.
|
||
specialize ih with (1 := eq_refl).
|
||
hauto lq:on ctrs:OExp.R use:rtc_r.
|
||
- hauto l:on ctrs:OExp.R.
|
||
Qed.
|
||
|
||
Lemma Univ_EPar' n i (u : PTm n) :
|
||
EPar.R (PUniv i) u ->
|
||
rtc OExp.R (PUniv i) u.
|
||
move E : (PUniv i) => t h.
|
||
move : E. elim : n t u /h => //=.
|
||
- move => n a0 a1 h ih ?. subst.
|
||
specialize ih with (1 := eq_refl).
|
||
hauto lq:on ctrs:OExp.R use:rtc_r.
|
||
- move => n a0 a1 h ih ?. subst.
|
||
specialize ih with (1 := eq_refl).
|
||
hauto lq:on ctrs:OExp.R use:rtc_r.
|
||
- hauto l:on ctrs:OExp.R.
|
||
Qed.
|
||
|
||
Lemma EPar_diamond n (c a1 b1 : PTm n) :
|
||
EPar.R c a1 ->
|
||
EPar.R c b1 ->
|
||
exists d2, EPar.R a1 d2 /\ EPar.R b1 d2.
|
||
Proof.
|
||
move => h. move : b1. elim : n c a1 / h.
|
||
- move => n c a1 ha iha b1 /iha [d2 [hd0 hd1]].
|
||
exists(PAbs (PApp (ren_PTm shift d2) (VarPTm var_zero))).
|
||
hauto lq:on ctrs:EPar.R use:EPar.renaming.
|
||
- hauto lq:on rew:off ctrs:EPar.R.
|
||
- hauto lq:on use:EPar.refl.
|
||
- move => n a0 a1 ha iha a2.
|
||
move /Abs_EPar' => [d [hd0 hd1]].
|
||
move : iha hd0; repeat move/[apply].
|
||
move => [d2 [h0 h1]].
|
||
have : EPar.R (PAbs d) (PAbs d2) by eauto using EPar.AbsCong.
|
||
move : OExp.commutativity0 hd1; repeat move/[apply].
|
||
move => [d1 [hd1 hd2]].
|
||
exists d1. hauto lq:on ctrs:EPar.R use:OExp.merge.
|
||
- move => n a0 a1 b0 b1 ha iha hb ihb c.
|
||
move /App_EPar' => [a2][b2][/iha [a3 h0]][/ihb [b3 h1]]h2 {iha ihb}.
|
||
have : EPar.R (PApp a2 b2)(PApp a3 b3)
|
||
by hauto l:on use:EPar.AppCong.
|
||
move : OExp.commutativity0 h2; repeat move/[apply].
|
||
move => [d h].
|
||
exists d. hauto lq:on rew:off ctrs:EPar.R use:OExp.merge.
|
||
- move => n a0 a1 b0 b1 ha iha hb ihb c.
|
||
move /Pair_EPar' => [a2][b2][/iha [a3 h0]][/ihb [b3 h1]]h2 {iha ihb}.
|
||
have : EPar.R (PPair a2 b2)(PPair a3 b3)
|
||
by hauto l:on use:EPar.PairCong.
|
||
move : OExp.commutativity0 h2; repeat move/[apply].
|
||
move => [d h].
|
||
exists d. hauto lq:on rew:off ctrs:EPar.R use:OExp.merge.
|
||
- move => n p a0 a1 ha iha b.
|
||
move /Proj_EPar' => [d [/iha [d2 h] h1]] {iha}.
|
||
have : EPar.R (PProj p d) (PProj p d2)
|
||
by hauto l:on use:EPar.ProjCong.
|
||
move : OExp.commutativity0 h1; repeat move/[apply].
|
||
move => [d1 h1].
|
||
exists d1. hauto lq:on rew:off ctrs:EPar.R use:OExp.merge.
|
||
- qauto use:Const_EPar', EPar.refl.
|
||
- qauto use:Univ_EPar', EPar.refl.
|
||
- qauto use:Bot_EPar', EPar.refl.
|
||
Qed.
|
||
|
||
Function tstar {n} (a : PTm n) :=
|
||
match a with
|
||
| VarPTm i => a
|
||
| PAbs a => PAbs (tstar a)
|
||
| PApp (PAbs a) b => subst_PTm (scons (tstar b) VarPTm) (tstar a)
|
||
| PApp (PPair a b) c =>
|
||
PPair (PApp (tstar a) (tstar c)) (PApp (tstar b) (tstar c))
|
||
| PApp a b => PApp (tstar a) (tstar b)
|
||
| PPair a b => PPair (tstar a) (tstar b)
|
||
| PProj p (PPair a b) => if p is PL then (tstar a) else (tstar b)
|
||
| PProj p (PAbs a) => (PAbs (PProj p (tstar a)))
|
||
| PProj p a => PProj p (tstar a)
|
||
| PConst k => PConst k
|
||
| PUniv i => PUniv i
|
||
| PBot => PBot
|
||
end.
|
||
|
||
Lemma RPar_triangle n (a : PTm n) : forall b, RPar.R a b -> RPar.R b (tstar a).
|
||
Proof.
|
||
apply tstar_ind => {n a}.
|
||
- hauto lq:on inv:RPar.R ctrs:RPar.R.
|
||
- hauto lq:on inv:RPar.R ctrs:RPar.R.
|
||
- hauto lq:on use:RPar.cong, RPar.refl ctrs:RPar.R inv:RPar.R.
|
||
- hauto lq:on rew:off ctrs:RPar.R inv:RPar.R.
|
||
- hauto lq:on rew:off inv:RPar.R ctrs:RPar.R.
|
||
- hauto lq:on rew:off inv:RPar.R ctrs:RPar.R.
|
||
- hauto drew:off inv:RPar.R use:RPar.refl, RPar.ProjPair'.
|
||
- hauto drew:off inv:RPar.R use:RPar.refl, RPar.ProjPair'.
|
||
- hauto lq:on inv:RPar.R ctrs:RPar.R.
|
||
- hauto lq:on inv:RPar.R ctrs:RPar.R.
|
||
- hauto lq:on inv:RPar.R ctrs:RPar.R.
|
||
- hauto lq:on inv:RPar.R ctrs:RPar.R.
|
||
- hauto lq:on inv:RPar.R ctrs:RPar.R.
|
||
Qed.
|
||
|
||
Function tstar' {n} (a : PTm n) :=
|
||
match a with
|
||
| VarPTm i => a
|
||
| PAbs a => PAbs (tstar' a)
|
||
| PApp (PAbs a) b => subst_PTm (scons (tstar' b) VarPTm) (tstar' a)
|
||
| PApp a b => PApp (tstar' a) (tstar' b)
|
||
| PPair a b => PPair (tstar' a) (tstar' b)
|
||
| PProj p (PPair a b) => if p is PL then (tstar' a) else (tstar' b)
|
||
| PProj p a => PProj p (tstar' a)
|
||
| PConst k => PConst k
|
||
| PUniv i => PUniv i
|
||
| PBot => PBot
|
||
end.
|
||
|
||
Lemma RPar'_triangle n (a : PTm n) : forall b, RPar'.R a b -> RPar'.R b (tstar' a).
|
||
Proof.
|
||
apply tstar'_ind => {n a}.
|
||
- hauto lq:on inv:RPar'.R ctrs:RPar'.R.
|
||
- hauto lq:on inv:RPar'.R ctrs:RPar'.R.
|
||
- hauto lq:on use:RPar'.cong, RPar'.refl ctrs:RPar'.R inv:RPar'.R.
|
||
- hauto lq:on rew:off ctrs:RPar'.R inv:RPar'.R.
|
||
- hauto lq:on rew:off inv:RPar'.R ctrs:RPar'.R.
|
||
- hauto drew:off inv:RPar'.R use:RPar'.refl, RPar'.ProjPair'.
|
||
- hauto drew:off inv:RPar'.R use:RPar'.refl, RPar'.ProjPair'.
|
||
- hauto lq:on inv:RPar'.R ctrs:RPar'.R.
|
||
- hauto lq:on inv:RPar'.R ctrs:RPar'.R.
|
||
- hauto lq:on inv:RPar'.R ctrs:RPar'.R.
|
||
- hauto lq:on inv:RPar'.R ctrs:RPar'.R.
|
||
Qed.
|
||
|
||
Lemma RPar_diamond n (c a1 b1 : PTm n) :
|
||
RPar.R c a1 ->
|
||
RPar.R c b1 ->
|
||
exists d2, RPar.R a1 d2 /\ RPar.R b1 d2.
|
||
Proof. hauto l:on use:RPar_triangle. Qed.
|
||
|
||
Lemma RPar'_diamond n (c a1 b1 : PTm n) :
|
||
RPar'.R c a1 ->
|
||
RPar'.R c b1 ->
|
||
exists d2, RPar'.R a1 d2 /\ RPar'.R b1 d2.
|
||
Proof. hauto l:on use:RPar'_triangle. Qed.
|
||
|
||
Lemma RPar_confluent n (c a1 b1 : PTm n) :
|
||
rtc RPar.R c a1 ->
|
||
rtc RPar.R c b1 ->
|
||
exists d2, rtc RPar.R a1 d2 /\ rtc RPar.R b1 d2.
|
||
Proof.
|
||
sfirstorder use:relations.diamond_confluent, RPar_diamond.
|
||
Qed.
|
||
|
||
Lemma RPar'_confluent n (c a1 b1 : PTm n) :
|
||
rtc RPar'.R c a1 ->
|
||
rtc RPar'.R c b1 ->
|
||
exists d2, rtc RPar'.R a1 d2 /\ rtc RPar'.R b1 d2.
|
||
Proof.
|
||
sfirstorder use:relations.diamond_confluent, RPar'_diamond.
|
||
Qed.
|
||
|
||
Lemma EPar_confluent n (c a1 b1 : PTm n) :
|
||
rtc EPar.R c a1 ->
|
||
rtc EPar.R c b1 ->
|
||
exists d2, rtc EPar.R a1 d2 /\ rtc EPar.R b1 d2.
|
||
Proof.
|
||
sfirstorder use:relations.diamond_confluent, EPar_diamond.
|
||
Qed.
|
||
|
||
Inductive prov {n} : PTm n -> PTm n -> Prop :=
|
||
| P_Abs h a :
|
||
(forall b, prov h (subst_PTm (scons b VarPTm) a)) ->
|
||
prov h (PAbs a)
|
||
| P_App h a b :
|
||
prov h a ->
|
||
prov h (PApp a b)
|
||
| P_Pair h a b :
|
||
prov h a ->
|
||
prov h b ->
|
||
prov h (PPair a b)
|
||
| P_Proj h p a :
|
||
prov h a ->
|
||
prov h (PProj p a)
|
||
| P_Const k :
|
||
prov (PConst k) (PConst k)
|
||
| P_Var i :
|
||
prov (VarPTm i) (VarPTm i)
|
||
| P_Univ i :
|
||
prov (PUniv i) (PUniv i)
|
||
| P_Bot :
|
||
prov PBot PBot.
|
||
|
||
Lemma ERed_EPar n (a b : PTm n) : ERed.R a b -> EPar.R a b.
|
||
Proof.
|
||
induction 1; hauto lq:on ctrs:EPar.R use:EPar.refl.
|
||
Qed.
|
||
|
||
Lemma EPar_ERed n (a b : PTm n) : EPar.R a b -> rtc ERed.R a b.
|
||
Proof.
|
||
move => h. elim : n a b /h.
|
||
- eauto using rtc_r, ERed.AppEta.
|
||
- eauto using rtc_r, ERed.PairEta.
|
||
- auto using rtc_refl.
|
||
- eauto using EReds.AbsCong.
|
||
- eauto using EReds.AppCong.
|
||
- eauto using EReds.PairCong.
|
||
- eauto using EReds.ProjCong.
|
||
- auto using rtc_refl.
|
||
- auto using rtc_refl.
|
||
- auto using rtc_refl.
|
||
Qed.
|
||
|
||
Lemma EPar_Par n (a b : PTm n) : EPar.R a b -> Par.R a b.
|
||
Proof.
|
||
move => h. elim : n a b /h; qauto ctrs:Par.R.
|
||
Qed.
|
||
|
||
Lemma RPar_Par n (a b : PTm n) : RPar.R a b -> Par.R a b.
|
||
Proof.
|
||
move => h. elim : n a b /h; hauto lq:on ctrs:Par.R.
|
||
Qed.
|
||
|
||
Lemma rtc_idem n (R : PTm n -> PTm n -> Prop) (a b : PTm n) : rtc (rtc R) a b -> rtc R a b.
|
||
Proof.
|
||
induction 1; hauto l:on use:@relations.rtc_transitive, @rtc_r.
|
||
Qed.
|
||
|
||
Lemma EPars_EReds {n} (a b : PTm n) : rtc EPar.R a b <-> rtc ERed.R a b.
|
||
Proof.
|
||
sfirstorder use:@relations.rtc_subrel, EPar_ERed, rtc_idem, ERed_EPar.
|
||
Qed.
|
||
|
||
Lemma prov_rpar n (u : PTm n) a b : prov u a -> RPar.R a b -> prov u b.
|
||
Proof.
|
||
move => h.
|
||
move : b.
|
||
elim : u a / h.
|
||
(* - qauto l:on ctrs:prov inv:RPar.R use:@rtc_r, RPar_Par. *)
|
||
- hauto lq:on ctrs:prov inv:RPar.R use:RPar.substing.
|
||
- move => h a b ha iha b0.
|
||
elim /RPar.inv => //= _.
|
||
+ move => a0 a1 b1 b2 h0 h1 [*]. subst.
|
||
have {}iha : prov h (PAbs a1) by hauto lq:on ctrs:RPar.R.
|
||
hauto lq:on inv:prov use:RPar.substing.
|
||
+ move => a0 a1 b1 b2 c0 c1.
|
||
move => h0 h1 h2 [*]. subst.
|
||
have {}iha : prov h (PPair a1 b2) by hauto lq:on ctrs:RPar.R.
|
||
hauto lq:on inv:prov ctrs:prov.
|
||
+ hauto lq:on ctrs:prov.
|
||
- hauto lq:on ctrs:prov inv:RPar.R.
|
||
- move => h p a ha iha b.
|
||
elim /RPar.inv => //= _.
|
||
+ move => p0 a0 a1 h0 [*]. subst.
|
||
have {iha} : prov h (PAbs a1) by hauto lq:on ctrs:RPar.R.
|
||
hauto lq:on ctrs:prov inv:prov use:RPar.substing.
|
||
+ move => p0 a0 a1 b0 b1 h0 h1 [*]. subst.
|
||
have {iha} : prov h (PPair a1 b1) by hauto lq:on ctrs:RPar.R.
|
||
qauto l:on inv:prov.
|
||
+ hauto lq:on ctrs:prov.
|
||
- hauto lq:on ctrs:prov inv:RPar.R.
|
||
- hauto l:on ctrs:RPar.R inv:RPar.R.
|
||
- hauto l:on ctrs:RPar.R inv:RPar.R.
|
||
- hauto l:on ctrs:RPar.R inv:RPar.R.
|
||
Qed.
|
||
|
||
|
||
Lemma prov_lam n (u : PTm n) a : prov u a <-> prov u (PAbs (PApp (ren_PTm shift a) (VarPTm var_zero))).
|
||
Proof.
|
||
split.
|
||
move => h. constructor. move => b. asimpl. by constructor.
|
||
inversion 1; subst.
|
||
specialize H2 with (b := PBot).
|
||
move : H2. asimpl. inversion 1; subst. done.
|
||
Qed.
|
||
|
||
Lemma prov_pair n (u : PTm n) a : prov u a <-> prov u (PPair (PProj PL a) (PProj PR a)).
|
||
Proof. hauto lq:on inv:prov ctrs:prov. Qed.
|
||
|
||
Lemma prov_ered n (u : PTm n) a b : prov u a -> ERed.R a b -> prov u b.
|
||
Proof.
|
||
move => h.
|
||
move : b.
|
||
elim : u a / h.
|
||
- move => h a ha iha b.
|
||
elim /ERed.inv => // _.
|
||
+ move => a0 *. subst.
|
||
rewrite -prov_lam.
|
||
by constructor.
|
||
+ move => a0 *. subst.
|
||
rewrite -prov_pair.
|
||
by constructor.
|
||
+ hauto lq:on ctrs:prov use:ERed.substing.
|
||
- hauto lq:on inv:ERed.R, prov ctrs:prov.
|
||
- move => h a b ha iha hb ihb b0.
|
||
elim /ERed.inv => //_.
|
||
+ move => a0 *. subst.
|
||
rewrite -prov_lam.
|
||
by constructor.
|
||
+ move => a0 *. subst.
|
||
rewrite -prov_pair.
|
||
by constructor.
|
||
+ hauto lq:on ctrs:prov.
|
||
+ hauto lq:on ctrs:prov.
|
||
- hauto lq:on inv:ERed.R, prov ctrs:prov.
|
||
- hauto lq:on inv:ERed.R, prov ctrs:prov.
|
||
- hauto lq:on inv:ERed.R, prov ctrs:prov.
|
||
- hauto lq:on inv:ERed.R, prov ctrs:prov.
|
||
- hauto lq:on inv:ERed.R, prov ctrs:prov.
|
||
Qed.
|
||
|
||
Lemma prov_ereds n (u : PTm n) a b : prov u a -> rtc ERed.R a b -> prov u b.
|
||
Proof.
|
||
induction 2; sfirstorder use:prov_ered.
|
||
Qed.
|
||
|
||
Fixpoint extract {n} (a : PTm n) : PTm n :=
|
||
match a with
|
||
| PAbs a => subst_PTm (scons PBot VarPTm) (extract a)
|
||
| PApp a b => extract a
|
||
| PPair a b => extract a
|
||
| PProj p a => extract a
|
||
| PConst k => PConst k
|
||
| VarPTm i => VarPTm i
|
||
| PUniv i => PUniv i
|
||
| PBot => PBot
|
||
end.
|
||
|
||
Lemma ren_extract n m (a : PTm n) (ξ : fin n -> fin m) :
|
||
extract (ren_PTm ξ a) = ren_PTm ξ (extract a).
|
||
Proof.
|
||
move : m ξ. elim : n/a.
|
||
- sfirstorder.
|
||
- move => n a ih m ξ /=.
|
||
rewrite ih.
|
||
by asimpl.
|
||
- hauto q:on.
|
||
- hauto q:on.
|
||
- hauto q:on.
|
||
- hauto q:on.
|
||
- sfirstorder.
|
||
- sfirstorder.
|
||
Qed.
|
||
|
||
Lemma ren_morphing n m (a : PTm n) (ρ : fin n -> PTm m) :
|
||
(forall i, ρ i = extract (ρ i)) ->
|
||
extract (subst_PTm ρ a) = subst_PTm ρ (extract a).
|
||
Proof.
|
||
move : m ρ.
|
||
elim : n /a => n //=.
|
||
move => a ha m ρ hi.
|
||
rewrite ha.
|
||
- destruct i as [i|] => //.
|
||
rewrite ren_extract.
|
||
rewrite -hi.
|
||
by asimpl.
|
||
- by asimpl.
|
||
Qed.
|
||
|
||
Lemma ren_subst_bot n (a : PTm (S n)) :
|
||
extract (subst_PTm (scons PBot VarPTm) a) = subst_PTm (scons PBot VarPTm) (extract a).
|
||
Proof.
|
||
apply ren_morphing. destruct i as [i|] => //=.
|
||
Qed.
|
||
|
||
Definition prov_extract_spec {n} u (a : PTm n) :=
|
||
match u with
|
||
| PUniv i => extract a = PUniv i
|
||
| VarPTm i => extract a = VarPTm i
|
||
| (PConst i) => extract a = (PConst i)
|
||
| PBot => extract a = PBot
|
||
| _ => True
|
||
end.
|
||
|
||
Lemma prov_extract n u (a : PTm n) :
|
||
prov u a -> prov_extract_spec u a.
|
||
Proof.
|
||
move => h.
|
||
elim : u a /h.
|
||
- move => h a ha ih.
|
||
case : h ha ih => //=.
|
||
+ move => i ha ih.
|
||
move /(_ PBot) in ih.
|
||
rewrite -ih.
|
||
by rewrite ren_subst_bot.
|
||
+ move => p _ /(_ PBot).
|
||
by rewrite ren_subst_bot.
|
||
+ move => i h /(_ PBot).
|
||
by rewrite ren_subst_bot => ->.
|
||
+ move /(_ PBot).
|
||
move => h /(_ PBot).
|
||
by rewrite ren_subst_bot.
|
||
- hauto lq:on.
|
||
- hauto lq:on.
|
||
- hauto lq:on.
|
||
- case => //=.
|
||
- sfirstorder.
|
||
- sfirstorder.
|
||
- sfirstorder.
|
||
Qed.
|
||
|
||
Definition union {A : Type} (R0 R1 : A -> A -> Prop) a b :=
|
||
R0 a b \/ R1 a b.
|
||
|
||
Module ERPar.
|
||
Definition R {n} (a b : PTm n) := union RPar.R EPar.R a b.
|
||
Lemma RPar {n} (a b : PTm n) : RPar.R a b -> R a b.
|
||
Proof. sfirstorder. Qed.
|
||
|
||
Lemma EPar {n} (a b : PTm n) : EPar.R a b -> R a b.
|
||
Proof. sfirstorder. Qed.
|
||
|
||
Lemma refl {n} ( a : PTm n) : ERPar.R a a.
|
||
Proof.
|
||
sfirstorder use:RPar.refl, EPar.refl.
|
||
Qed.
|
||
|
||
Lemma ProjCong n p (a0 a1 : PTm n) :
|
||
R a0 a1 ->
|
||
rtc R (PProj p a0) (PProj p a1).
|
||
Proof.
|
||
move => [].
|
||
- move => h.
|
||
apply rtc_once.
|
||
left.
|
||
by apply RPar.ProjCong.
|
||
- move => h.
|
||
apply rtc_once.
|
||
right.
|
||
by apply EPar.ProjCong.
|
||
Qed.
|
||
|
||
Lemma AbsCong n (a0 a1 : PTm (S n)) :
|
||
R a0 a1 ->
|
||
rtc R (PAbs a0) (PAbs a1).
|
||
Proof.
|
||
move => [].
|
||
- move => h.
|
||
apply rtc_once.
|
||
left.
|
||
by apply RPar.AbsCong.
|
||
- move => h.
|
||
apply rtc_once.
|
||
right.
|
||
by apply EPar.AbsCong.
|
||
Qed.
|
||
|
||
Lemma AppCong n (a0 a1 b0 b1 : PTm n) :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
rtc R (PApp a0 b0) (PApp a1 b1).
|
||
Proof.
|
||
move => [] + [].
|
||
- sfirstorder use:RPar.AppCong, @rtc_once.
|
||
- move => h0 h1.
|
||
apply : rtc_l.
|
||
left. apply RPar.AppCong; eauto; apply RPar.refl.
|
||
apply rtc_once.
|
||
hauto l:on use:EPar.AppCong, EPar.refl.
|
||
- move => h0 h1.
|
||
apply : rtc_l.
|
||
left. apply RPar.AppCong; eauto; apply RPar.refl.
|
||
apply rtc_once.
|
||
hauto l:on use:EPar.AppCong, EPar.refl.
|
||
- sfirstorder use:EPar.AppCong, @rtc_once.
|
||
Qed.
|
||
|
||
Lemma PairCong n (a0 a1 b0 b1 : PTm n) :
|
||
R a0 a1 ->
|
||
R b0 b1 ->
|
||
rtc R (PPair a0 b0) (PPair a1 b1).
|
||
Proof.
|
||
move => [] + [].
|
||
- sfirstorder use:RPar.PairCong, @rtc_once.
|
||
- move => h0 h1.
|
||
apply : rtc_l.
|
||
left. apply RPar.PairCong; eauto; apply RPar.refl.
|
||
apply rtc_once.
|
||
hauto l:on use:EPar.PairCong, EPar.refl.
|
||
- move => h0 h1.
|
||
apply : rtc_l.
|
||
left. apply RPar.PairCong; eauto; apply RPar.refl.
|
||
apply rtc_once.
|
||
hauto l:on use:EPar.PairCong, EPar.refl.
|
||
- sfirstorder use:EPar.PairCong, @rtc_once.
|
||
Qed.
|
||
|
||
Lemma renaming n m (a b : PTm n) (ξ : fin n -> fin m) :
|
||
R a b -> R (ren_PTm ξ a) (ren_PTm ξ b).
|
||
Proof.
|
||
sfirstorder use:EPar.renaming, RPar.renaming.
|
||
Qed.
|
||
|
||
End ERPar.
|
||
|
||
Hint Resolve ERPar.AppCong ERPar.refl ERPar.AbsCong ERPar.PairCong ERPar.ProjCong : erpar.
|
||
|
||
Module ERPars.
|
||
#[local]Ltac solve_s_rec :=
|
||
move => *; eapply relations.rtc_transitive; eauto;
|
||
hauto lq:on db:erpar.
|
||
#[local]Ltac solve_s :=
|
||
repeat (induction 1; last by solve_s_rec); apply rtc_refl.
|
||
|
||
Lemma AppCong n (a0 a1 b0 b1 : PTm n) :
|
||
rtc ERPar.R a0 a1 ->
|
||
rtc ERPar.R b0 b1 ->
|
||
rtc ERPar.R (PApp a0 b0) (PApp a1 b1).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma AbsCong n (a0 a1 : PTm (S n)) :
|
||
rtc ERPar.R a0 a1 ->
|
||
rtc ERPar.R (PAbs a0) (PAbs a1).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma PairCong n (a0 a1 b0 b1 : PTm n) :
|
||
rtc ERPar.R a0 a1 ->
|
||
rtc ERPar.R b0 b1 ->
|
||
rtc ERPar.R (PPair a0 b0) (PPair a1 b1).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma ProjCong n p (a0 a1 : PTm n) :
|
||
rtc ERPar.R a0 a1 ->
|
||
rtc ERPar.R (PProj p a0) (PProj p a1).
|
||
Proof. solve_s. Qed.
|
||
|
||
Lemma renaming n (a0 a1 : PTm n) m (ξ : fin n -> fin m) :
|
||
rtc ERPar.R a0 a1 ->
|
||
rtc ERPar.R (ren_PTm ξ a0) (ren_PTm ξ a1).
|
||
Proof.
|
||
induction 1.
|
||
- apply rtc_refl.
|
||
- eauto using ERPar.renaming, rtc_l.
|
||
Qed.
|
||
|
||
End ERPars.
|
||
|
||
Lemma ERPar_Par n (a b : PTm n) : ERPar.R a b -> Par.R a b.
|
||
Proof.
|
||
sfirstorder use:EPar_Par, RPar_Par.
|
||
Qed.
|
||
|
||
Lemma Par_ERPar n (a b : PTm n) : Par.R a b -> rtc ERPar.R a b.
|
||
Proof.
|
||
move => h. elim : n a b /h.
|
||
- move => n a0 a1 b0 b1 ha iha hb ihb.
|
||
suff ? : rtc ERPar.R (PApp (PAbs a0) b0) (PApp (PAbs a1) b1).
|
||
apply : relations.rtc_transitive; eauto.
|
||
apply rtc_once. apply ERPar.RPar.
|
||
by apply RPar.AppAbs; eauto using RPar.refl.
|
||
eauto using ERPars.AppCong,ERPars.AbsCong.
|
||
- move => n a0 a1 b0 b1 c0 c1 ha iha hb ihb hc ihc.
|
||
apply : rtc_l. apply ERPar.RPar.
|
||
apply RPar.AppPair; eauto using RPar.refl.
|
||
sfirstorder use:ERPars.AppCong, ERPars.PairCong.
|
||
- move => n p a0 a1 ha iha.
|
||
apply : rtc_l. apply ERPar.RPar. apply RPar.ProjAbs; eauto using RPar.refl.
|
||
sfirstorder use:ERPars.AbsCong, ERPars.ProjCong.
|
||
- move => n p a0 a1 b0 b1 ha iha hb ihb.
|
||
apply : rtc_l. apply ERPar.RPar. apply RPar.ProjPair; eauto using RPar.refl.
|
||
hauto lq:on.
|
||
- move => n a0 a1 ha iha.
|
||
apply : rtc_l. apply ERPar.EPar. apply EPar.AppEta; eauto using EPar.refl.
|
||
hauto lq:on ctrs:rtc
|
||
use:ERPars.AppCong, ERPars.AbsCong, ERPars.renaming.
|
||
- move => n a0 a1 ha iha.
|
||
apply : rtc_l. apply ERPar.EPar. apply EPar.PairEta; eauto using EPar.refl.
|
||
sfirstorder use:ERPars.PairCong, ERPars.ProjCong.
|
||
- sfirstorder.
|
||
- sfirstorder use:ERPars.AbsCong.
|
||
- sfirstorder use:ERPars.AppCong.
|
||
- sfirstorder use:ERPars.PairCong.
|
||
- sfirstorder use:ERPars.ProjCong.
|
||
- sfirstorder.
|
||
- sfirstorder.
|
||
- sfirstorder.
|
||
Qed.
|
||
|
||
Lemma Pars_ERPar n (a b : PTm n) : rtc Par.R a b -> rtc ERPar.R a b.
|
||
Proof.
|
||
induction 1; hauto l:on use:Par_ERPar, @relations.rtc_transitive.
|
||
Qed.
|
||
|
||
Lemma Par_ERPar_iff n (a b : PTm n) : rtc Par.R a b <-> rtc ERPar.R a b.
|
||
Proof.
|
||
split.
|
||
sfirstorder use:Pars_ERPar, @relations.rtc_subrel.
|
||
sfirstorder use:ERPar_Par, @relations.rtc_subrel.
|
||
Qed.
|
||
|
||
Lemma RPar_ERPar n (a b : PTm n) : rtc RPar.R a b -> rtc ERPar.R a b.
|
||
Proof.
|
||
sfirstorder use:@relations.rtc_subrel.
|
||
Qed.
|
||
|
||
Lemma EPar_ERPar n (a b : PTm n) : rtc EPar.R a b -> rtc ERPar.R a b.
|
||
Proof.
|
||
sfirstorder use:@relations.rtc_subrel.
|
||
Qed.
|
||
|
||
Module Type HindleyRosen.
|
||
Parameter A : nat -> Type.
|
||
Parameter R0 R1 : forall n, A n -> A n -> Prop.
|
||
Axiom diamond_R0 : forall n, relations.diamond (R0 n).
|
||
Axiom diamond_R1 : forall n, relations.diamond (R1 n).
|
||
Axiom commutativity : forall n,
|
||
forall a b c, R0 n a b -> R1 n a c -> exists d, R1 n b d /\ R0 n c d.
|
||
End HindleyRosen.
|
||
|
||
Module HindleyRosenFacts (M : HindleyRosen).
|
||
Import M.
|
||
Lemma R0_comm :
|
||
forall n a b c, R0 n a b -> rtc (union (R0 n) (R1 n)) a c ->
|
||
exists d, rtc (union (R0 n) (R1 n)) b d /\ R0 n c d.
|
||
Proof.
|
||
move => n a + c + h.
|
||
elim : a c /h.
|
||
- sfirstorder.
|
||
- move => a0 a1 a2 ha ha0 ih b h.
|
||
case : ha.
|
||
+ move : diamond_R0 h; repeat move/[apply].
|
||
hauto lq:on ctrs:rtc.
|
||
+ move : commutativity h; repeat move/[apply].
|
||
hauto lq:on ctrs:rtc.
|
||
Qed.
|
||
|
||
Lemma R1_comm :
|
||
forall n a b c, R1 n a b -> rtc (union (R0 n) (R1 n)) a c ->
|
||
exists d, rtc (union (R0 n) (R1 n)) b d /\ R1 n c d.
|
||
Proof.
|
||
move => n a + c + h.
|
||
elim : a c /h.
|
||
- sfirstorder.
|
||
- move => a0 a1 a2 ha ha0 ih b h.
|
||
case : ha.
|
||
+ move : commutativity h; repeat move/[apply].
|
||
hauto lq:on ctrs:rtc.
|
||
+ move : diamond_R1 h; repeat move/[apply].
|
||
hauto lq:on ctrs:rtc.
|
||
Qed.
|
||
|
||
Lemma U_comm :
|
||
forall n a b c, (union (R0 n) (R1 n)) a b -> rtc (union (R0 n) (R1 n)) a c ->
|
||
exists d, rtc (union (R0 n) (R1 n)) b d /\ (union (R0 n) (R1 n)) c d.
|
||
Proof.
|
||
hauto lq:on use:R0_comm, R1_comm.
|
||
Qed.
|
||
|
||
Lemma U_comms :
|
||
forall n a b c, rtc (union (R0 n) (R1 n)) a b -> rtc (union (R0 n) (R1 n)) a c ->
|
||
exists d, rtc (union (R0 n) (R1 n)) b d /\ rtc (union (R0 n) (R1 n)) c d.
|
||
Proof.
|
||
move => n a b + h.
|
||
elim : a b /h.
|
||
- sfirstorder.
|
||
- hecrush ctrs:rtc use:U_comm.
|
||
Qed.
|
||
|
||
End HindleyRosenFacts.
|
||
|
||
Module HindleyRosenER <: HindleyRosen.
|
||
Definition A := PTm.
|
||
Definition R0 n := rtc (@RPar.R n).
|
||
Definition R1 n := rtc (@EPar.R n).
|
||
Lemma diamond_R0 : forall n, relations.diamond (R0 n).
|
||
sfirstorder use:RPar_confluent.
|
||
Qed.
|
||
Lemma diamond_R1 : forall n, relations.diamond (R1 n).
|
||
sfirstorder use:EPar_confluent.
|
||
Qed.
|
||
Lemma commutativity : forall n,
|
||
forall a b c, R0 n a b -> R1 n a c -> exists d, R1 n b d /\ R0 n c d.
|
||
Proof.
|
||
hauto l:on use:commutativity.
|
||
Qed.
|
||
End HindleyRosenER.
|
||
|
||
Module ERFacts := HindleyRosenFacts HindleyRosenER.
|
||
|
||
Lemma rtc_union n (a b : PTm n) :
|
||
rtc (union RPar.R EPar.R) a b <->
|
||
rtc (union (rtc RPar.R) (rtc EPar.R)) a b.
|
||
Proof.
|
||
split; first by induction 1; hauto lq:on ctrs:rtc.
|
||
move => h.
|
||
elim :a b /h.
|
||
- sfirstorder.
|
||
- move => a0 a1 a2.
|
||
case.
|
||
+ move => h0 h1 ih.
|
||
apply : relations.rtc_transitive; eauto.
|
||
move : h0.
|
||
apply relations.rtc_subrel.
|
||
sfirstorder.
|
||
+ move => h0 h1 ih.
|
||
apply : relations.rtc_transitive; eauto.
|
||
move : h0.
|
||
apply relations.rtc_subrel.
|
||
sfirstorder.
|
||
Qed.
|
||
|
||
Lemma prov_erpar n (u : PTm n) a b : prov u a -> ERPar.R a b -> prov u b.
|
||
Proof.
|
||
move => h [].
|
||
- sfirstorder use:prov_rpar.
|
||
- move /EPar_ERed.
|
||
sfirstorder use:prov_ereds.
|
||
Qed.
|
||
|
||
Lemma prov_pars n (u : PTm n) a b : prov u a -> rtc Par.R a b -> prov u b.
|
||
Proof.
|
||
move => h /Pars_ERPar.
|
||
move => h0.
|
||
move : h.
|
||
elim : a b /h0.
|
||
- done.
|
||
- hauto lq:on use:prov_erpar.
|
||
Qed.
|
||
|
||
Lemma Par_confluent n (a b c : PTm n) :
|
||
rtc Par.R a b ->
|
||
rtc Par.R a c ->
|
||
exists d, rtc Par.R b d /\ rtc Par.R c d.
|
||
Proof.
|
||
move : n a b c.
|
||
suff : forall (n : nat) (a b c : PTm n),
|
||
rtc ERPar.R a b ->
|
||
rtc ERPar.R a c -> exists d : PTm n, rtc ERPar.R b d /\ rtc ERPar.R c d.
|
||
move => h n a b c h0 h1.
|
||
apply Par_ERPar_iff in h0, h1.
|
||
move : h h0 h1; repeat move/[apply].
|
||
hauto lq:on use:Par_ERPar_iff.
|
||
have h := ERFacts.U_comms.
|
||
move => n a b c.
|
||
rewrite /HindleyRosenER.R0 /HindleyRosenER.R1 in h.
|
||
specialize h with (n := n).
|
||
rewrite /HindleyRosenER.A in h.
|
||
rewrite /ERPar.R.
|
||
have eq : (fun a0 b0 : PTm n => union RPar.R EPar.R a0 b0) = union RPar.R EPar.R by reflexivity.
|
||
rewrite !{}eq.
|
||
move /rtc_union => + /rtc_union.
|
||
move : h; repeat move/[apply].
|
||
hauto lq:on use:rtc_union.
|
||
Qed.
|
||
|
||
Lemma pars_univ_inv n i (c : PTm n) :
|
||
rtc Par.R (PUniv i) c ->
|
||
extract c = PUniv i.
|
||
Proof.
|
||
have : prov (PUniv i) (PUniv i : PTm n) by sfirstorder.
|
||
move : prov_pars. repeat move/[apply].
|
||
apply prov_extract.
|
||
Qed.
|
||
|
||
Lemma pars_const_inv n i (c : PTm n) :
|
||
rtc Par.R (PConst i) c ->
|
||
extract c = PConst i.
|
||
Proof.
|
||
have : prov (PConst i) (PConst i : PTm n) by sfirstorder.
|
||
move : prov_pars. repeat move/[apply].
|
||
apply prov_extract.
|
||
Qed.
|
||
|
||
Lemma pars_var_inv n (i : fin n) C :
|
||
rtc Par.R (VarPTm i) C ->
|
||
extract C = VarPTm i.
|
||
Proof.
|
||
have : prov (VarPTm i) (VarPTm i) by hauto lq:on ctrs:prov, rtc.
|
||
move : prov_pars. repeat move/[apply].
|
||
apply prov_extract.
|
||
Qed.
|
||
|
||
Lemma pars_univ_inj n i j (C : PTm n) :
|
||
rtc Par.R (PUniv i) C ->
|
||
rtc Par.R (PUniv j) C ->
|
||
i = j.
|
||
Proof.
|
||
sauto l:on use:pars_univ_inv.
|
||
Qed.
|
||
|
||
Lemma pars_const_inj n i j (C : PTm n) :
|
||
rtc Par.R (PConst i) C ->
|
||
rtc Par.R (PConst j) C ->
|
||
i = j.
|
||
Proof.
|
||
sauto l:on use:pars_const_inv.
|
||
Qed.
|
||
|
||
Definition join {n} (a b : PTm n) :=
|
||
exists c, rtc Par.R a c /\ rtc Par.R b c.
|
||
|
||
Lemma join_transitive n (a b c : PTm n) :
|
||
join a b -> join b c -> join a c.
|
||
Proof.
|
||
rewrite /join.
|
||
move => [ab [h0 h1]] [bc [h2 h3]].
|
||
move : Par_confluent h1 h2; repeat move/[apply].
|
||
move => [abc [h4 h5]].
|
||
eauto using relations.rtc_transitive.
|
||
Qed.
|
||
|
||
Lemma join_symmetric n (a b : PTm n) :
|
||
join a b -> join b a.
|
||
Proof. sfirstorder unfold:join. Qed.
|
||
|
||
Lemma join_refl n (a : PTm n) : join a a.
|
||
Proof. hauto lq:on ctrs:rtc unfold:join. Qed.
|
||
|
||
Lemma join_univ_inj n i j :
|
||
join (PUniv i : PTm n) (PUniv j) -> i = j.
|
||
Proof.
|
||
sfirstorder use:pars_univ_inj.
|
||
Qed.
|
||
|
||
Lemma join_const_inj n i j :
|
||
join (PConst i : PTm n) (PConst j) -> i = j.
|
||
Proof.
|
||
sfirstorder use:pars_const_inj.
|
||
Qed.
|
||
|
||
Lemma join_substing n m (a b : PTm n) (ρ : fin n -> PTm m) :
|
||
join a b ->
|
||
join (subst_PTm ρ a) (subst_PTm ρ b).
|
||
Proof. hauto lq:on unfold:join use:Pars.substing. Qed.
|
||
|
||
Fixpoint ne {n} (a : PTm n) :=
|
||
match a with
|
||
| VarPTm i => true
|
||
| PApp a b => ne a && nf b
|
||
| PAbs a => false
|
||
| PUniv _ => false
|
||
| PProj _ a => ne a
|
||
| PPair _ _ => false
|
||
| PConst _ => false
|
||
| PBot => true
|
||
end
|
||
with nf {n} (a : PTm n) :=
|
||
match a with
|
||
| VarPTm i => true
|
||
| PApp a b => ne a && nf b
|
||
| PAbs a => nf a
|
||
| PUniv _ => true
|
||
| PProj _ a => ne a
|
||
| PPair a b => nf a && nf b
|
||
| PConst _ => true
|
||
| PBot => true
|
||
end.
|
||
|
||
Lemma ne_nf n a : @ne n a -> nf a.
|
||
Proof. elim : a => //=. Qed.
|
||
|
||
Definition wn {n} (a : PTm n) := exists b, rtc RPar'.R a b /\ nf b.
|
||
Definition wne {n} (a : PTm n) := exists b, rtc RPar'.R a b /\ ne b.
|
||
|
||
(* Weakly neutral implies weakly normal *)
|
||
Lemma wne_wn n a : @wne n a -> wn a.
|
||
Proof. sfirstorder use:ne_nf. Qed.
|
||
|
||
(* Normal implies weakly normal *)
|
||
Lemma nf_wn n v : @nf n v -> wn v.
|
||
Proof. sfirstorder ctrs:rtc. Qed.
|
||
|
||
Lemma nf_refl n (a b : PTm n) (h : RPar'.R a b) : (nf a -> b = a) /\ (ne a -> b = a).
|
||
Proof.
|
||
elim : a b /h => //=; solve [hauto b:on].
|
||
Qed.
|
||
|
||
Lemma nf_refls n (a b : PTm n) (h : rtc RPar'.R a b) : (nf a -> b = a) /\ (ne a -> b = a).
|
||
Proof.
|
||
induction h; sauto lq:on rew:off ctrs:rtc use:nf_refl.
|
||
Qed.
|
||
|
||
Lemma ne_nf_ren n m (a : PTm n) (ξ : fin n -> fin m) :
|
||
(ne a <-> ne (ren_PTm ξ a)) /\ (nf a <-> nf (ren_PTm ξ a)).
|
||
Proof.
|
||
move : m ξ. elim : n / a => //=; solve [hauto b:on].
|
||
Qed.
|
||
|
||
Lemma wne_app n (a b : PTm n) :
|
||
wne a -> wn b -> wne (PApp a b).
|
||
Proof.
|
||
move => [a0 [? ?]] [b0 [? ?]].
|
||
exists (PApp a0 b0). hauto b:on drew:off use:RPars'.AppCong.
|
||
Qed.
|
||
|
||
Lemma wn_abs n a (h : wn a) : @wn n (PAbs a).
|
||
Proof.
|
||
move : h => [v [? ?]].
|
||
exists (PAbs v).
|
||
eauto using RPars'.AbsCong.
|
||
Qed.
|
||
|
||
Require Import Coq.Program.Equality.
|
||
|
||
Lemma wn_abs' n a (h : @wn n (PAbs a)) : wn a.
|
||
Proof.
|
||
move : h. move => [a0 [h0 h1]].
|
||
dependent induction h0; sauto q:on.
|
||
Qed.
|
||
|
||
Lemma wn_pair n (a b : PTm n) : wn a -> wn b -> wn (PPair a b).
|
||
Proof.
|
||
move => [a0 [? ?]] [b0 [? ?]].
|
||
exists (PPair a0 b0).
|
||
hauto lqb:on use:RPars'.PairCong.
|
||
Qed.
|
||
|
||
Lemma wne_proj n p (a : PTm n) : wne a -> wne (PProj p a).
|
||
Proof.
|
||
move => [a0 [? ?]].
|
||
exists (PProj p a0). hauto lqb:on use:RPars'.ProjCong.
|
||
Qed.
|
||
|
||
Create HintDb nfne.
|
||
#[export]Hint Resolve nf_wn ne_nf wne_wn nf_refl : nfne.
|
||
|
||
Lemma ne_nf_antiren n m (a : PTm n) (ρ : fin n -> PTm m) :
|
||
(forall i, var_or_const (ρ i)) ->
|
||
(ne (subst_PTm ρ a) -> ne a) /\ (nf (subst_PTm ρ a) -> nf a).
|
||
Proof.
|
||
move : m ρ. elim : n / a => //;
|
||
hauto b:on drew:off use:RPar.var_or_const_up.
|
||
Qed.
|
||
|
||
Lemma wn_antirenaming n m a (ρ : fin n -> PTm m) :
|
||
(forall i, var_or_const (ρ i)) ->
|
||
wn (subst_PTm ρ a) -> wn a.
|
||
Proof.
|
||
rewrite /wn => hρ.
|
||
move => [v [rv nfv]].
|
||
move /RPars'.antirenaming : rv.
|
||
move /(_ hρ) => [b [hb ?]]. subst.
|
||
exists b. split => //=.
|
||
move : nfv.
|
||
by eapply ne_nf_antiren.
|
||
Qed.
|
||
|
||
Lemma ext_wn n (a : PTm n) :
|
||
wn (PApp a PBot) ->
|
||
wn a.
|
||
Proof.
|
||
move E : (PApp a (PBot)) => a0 [v [hr hv]].
|
||
move : a E.
|
||
move : hv.
|
||
elim : a0 v / hr.
|
||
- hauto q:on inv:PTm ctrs:rtc b:on db: nfne.
|
||
- move => a0 a1 a2 hr0 hr1 ih hnfa2.
|
||
move /(_ hnfa2) in ih.
|
||
move => a.
|
||
case : a0 hr0=>// => b0 b1.
|
||
elim /RPar'.inv=>// _.
|
||
+ move => a0 a3 b2 b3 ? ? [? ?] ? [? ?]. subst.
|
||
have ? : b3 = (PBot) by hauto lq:on inv:RPar'.R. subst.
|
||
suff : wn (PAbs a3) by hauto lq:on ctrs:RPar'.R, rtc unfold:wn.
|
||
have : wn (subst_PTm (scons (PBot) VarPTm) a3) by sfirstorder.
|
||
move => h. apply wn_abs.
|
||
move : h. apply wn_antirenaming.
|
||
hauto lq:on rew:off inv:option.
|
||
+ hauto q:on inv:RPar'.R ctrs:rtc b:on.
|
||
Qed.
|
||
|
||
Module Join.
|
||
Lemma ProjCong p n (a0 a1 : PTm n) :
|
||
join a0 a1 ->
|
||
join (PProj p a0) (PProj p a1).
|
||
Proof. hauto lq:on use:Pars.ProjCong unfold:join. Qed.
|
||
|
||
Lemma PairCong n (a0 a1 b0 b1 : PTm n) :
|
||
join a0 a1 ->
|
||
join b0 b1 ->
|
||
join (PPair a0 b0) (PPair a1 b1).
|
||
Proof. hauto lq:on use:Pars.PairCong unfold:join. Qed.
|
||
|
||
Lemma AppCong n (a0 a1 b0 b1 : PTm n) :
|
||
join a0 a1 ->
|
||
join b0 b1 ->
|
||
join (PApp a0 b0) (PApp a1 b1).
|
||
Proof. hauto lq:on use:Pars.AppCong. Qed.
|
||
|
||
Lemma AbsCong n (a b : PTm (S n)) :
|
||
join a b ->
|
||
join (PAbs a) (PAbs b).
|
||
Proof. hauto lq:on use:Pars.AbsCong. Qed.
|
||
|
||
Lemma renaming n m (a b : PTm n) (ξ : fin n -> fin m) :
|
||
join a b -> join (ren_PTm ξ a) (ren_PTm ξ b).
|
||
Proof.
|
||
induction 1; hauto lq:on use:Pars.renaming.
|
||
Qed.
|
||
|
||
Lemma weakening n (a b : PTm n) :
|
||
join a b -> join (ren_PTm shift a) (ren_PTm shift b).
|
||
Proof.
|
||
apply renaming.
|
||
Qed.
|
||
|
||
Lemma FromPar n (a b : PTm n) :
|
||
Par.R a b ->
|
||
join a b.
|
||
Proof.
|
||
hauto lq:on ctrs:rtc use:rtc_once.
|
||
Qed.
|
||
End Join.
|
||
|
||
Lemma abs_eq n a (b : PTm n) :
|
||
join (PAbs a) b <-> join a (PApp (ren_PTm shift b) (VarPTm var_zero)).
|
||
Proof.
|
||
split.
|
||
- move => /Join.weakening h.
|
||
have {h} : join (PApp (ren_PTm shift (PAbs a)) (VarPTm var_zero)) (PApp (ren_PTm shift b) (VarPTm var_zero))
|
||
by hauto l:on use:Join.AppCong, join_refl.
|
||
simpl.
|
||
move => ?. apply : join_transitive; eauto.
|
||
apply join_symmetric. apply Join.FromPar.
|
||
apply : Par.AppAbs'; eauto using Par.refl. by asimpl.
|
||
- move /Join.AbsCong.
|
||
move /join_transitive. apply.
|
||
apply join_symmetric. apply Join.FromPar. apply Par.AppEta. apply Par.refl.
|
||
Qed.
|
||
|
||
Lemma pair_eq n (a0 a1 b : PTm n) :
|
||
join (PPair a0 a1) b <-> join a0 (PProj PL b) /\ join a1 (PProj PR b).
|
||
Proof.
|
||
split.
|
||
- move => h.
|
||
have /Join.ProjCong {}h := h.
|
||
have h0 : forall p, join (if p is PL then a0 else a1) (PProj p (PPair a0 a1))
|
||
by hauto lq:on use:join_symmetric, Join.FromPar, Par.ProjPair', Par.refl.
|
||
hauto lq:on rew:off use:join_transitive, join_symmetric.
|
||
- move => [h0 h1].
|
||
move : h0 h1.
|
||
move : Join.PairCong; repeat move/[apply].
|
||
move /join_transitive. apply. apply join_symmetric.
|
||
apply Join.FromPar. hauto lq:on ctrs:Par.R use:Par.refl.
|
||
Qed.
|
||
|
||
Lemma join_pair_inj n (a0 a1 b0 b1 : PTm n) :
|
||
join (PPair a0 a1) (PPair b0 b1) <-> join a0 b0 /\ join a1 b1.
|
||
Proof.
|
||
split; last by hauto lq:on use:Join.PairCong.
|
||
move /pair_eq => [h0 h1].
|
||
have : join (PProj PL (PPair b0 b1)) b0 by hauto lq:on use:Join.FromPar, Par.refl, Par.ProjPair'.
|
||
have : join (PProj PR (PPair b0 b1)) b1 by hauto lq:on use:Join.FromPar, Par.refl, Par.ProjPair'.
|
||
eauto using join_transitive.
|
||
Qed.
|
||
|
||
Lemma rpars_wn n (a b : PTm n) :
|
||
rtc RPar'.R a b -> wn a -> wn b.
|
||
Proof.
|
||
move => h [b0 [h0 h1]].
|
||
have : exists c, rtc RPar'.R b c /\ rtc RPar'.R b0 c by
|
||
eauto using RPar'_confluent.
|
||
move => [c [h2 h3]].
|
||
have ? : c = b0 by sfirstorder use:nf_refls. subst.
|
||
sfirstorder use:@relations.rtc_transitive.
|
||
Qed.
|
||
|
||
Lemma rpar_wn n (a b : PTm n) :
|
||
RPar'.R a b -> wn a -> wn b.
|
||
Proof. hauto lq:on use:rpars_wn ctrs:rtc. Qed.
|
||
|
||
Definition norm {n} (a b : PTm n) := rtc RPar'.R a b /\ nf b.
|
||
|
||
|
||
Lemma epar_wn n (a b : PTm n) :
|
||
ERed.R b a -> wn a -> wn b.
|
||
Proof.
|
||
move => h.
|
||
move => [v [h0 h1]].
|
||
move : b h1 h.
|
||
elim : a v /h0 .
|
||
- admit.
|
||
- move => a b v ha iha hb b0 hv hr.
|
||
specialize hb with (1 := hv).
|
||
|
||
|
||
- move => a h.
|
||
apply wn_abs' in h.
|
||
have {h} : wn (PApp a PBot) by admit.
|
||
apply ext_wn.
|
||
- move => a ha.
|
||
have [h0 h1] : wn (PProj PL a) /\ wn (PProj PR a) by admit.
|
||
admit.
|
||
- hauto q:on use:wn_abs, wn_abs'.
|
||
- move => a0 a1 b ha iha hb.
|