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chore: add simp lemma for converting Nat.add back into + notation

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Leonardo de Moura 2021-09-08 13:45:13 -07:00
parent bd02f16b43
commit 9032ddd773
1 changed files with 3 additions and 0 deletions
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src/Init/Data/Nat/Basic.lean
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@ -44,6 +44,9 @@ namespace Nat
@[simp] theorem zero_eq : Nat.zero = 0 :=
rfl
@[simp] theorem add_eq : Nat.add x y = x + y :=
rfl
@[simp] protected theorem zero_add : ∀ (n : Nat), 0 + n = n
| 0 => rfl
| n+1 => congrArg succ (Nat.zero_add n)