minor

README.md

@@ -7,9 +7,9 @@ Evaluation](https://www.brics.dk/RS/03/40/BRICS-RS-03-40.pdf) and
 [Abel's thesis on NbE](https://www.cse.chalmers.se/~abela/habil.pdf).
 
 Since the implementation is untyped, the `normalize` function only
-gives you $\beta$-normal forms. However, you can get a little bit of
-$\beta\eta$-equivalence by invoking Coquand's algorithm (`η-eq?`) on
-$\beta$-normal forms.
+gives you β-normal forms. However, you can get a little bit of
+βη-equivalence by invoking Coquand's algorithm (`η-eq?`) on
+β-normal forms.
 
 I'm hoping to expand the repository into a benchmark suite where I can
 visualize the performance trade-off of type-directed NbE compared to