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tiny fix to Properties

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wadler 2018-03-07 11:55:29 -03:00
parent ea44518e27
commit b088ee59cf
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src/Properties.lagda
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@ -14,7 +14,7 @@ by their name, properties of *inductive datatypes* are proved by
We require equivalence as in the previous chapter, plus the naturals
and some operations upon them. We also import a couple of new operations,
`cong` and `_≡⟨_⟩_`, which are explained below.
`cong`, `sym`, and `_≡⟨_⟩_`, which are explained below.
\begin{code}
import Relation.Binary.PropositionalEquality as Eq
open Eq using (_≡_; refl; cong; sym)