diff --git a/src/plfa/part2/Properties.lagda.md b/src/plfa/part2/Properties.lagda.md index c45d0a84..57f4178c 100644 --- a/src/plfa/part2/Properties.lagda.md +++ b/src/plfa/part2/Properties.lagda.md @@ -775,7 +775,7 @@ Where the construct introduces a bound variable we need to compare it with the substituted variable, applying the drop lemma if they are equal and the swap lemma if they are distinct. -Note that for Agda it makes a difference whether we write `x ≟ y` or +For Agda it makes a difference whether we write `x ≟ y` or `y ≟ x`. In an interactive proof, Agda will show which residual `with` clauses in the definition of `_[_:=_]` need to be simplified, and the `with` clauses in `subst` need to match these exactly. The guideline is