intro (_ : 0 ≃ (0 : ℕ))
ℕ : Type
inst✝² : Core ℕ
inst✝¹ : Induction ℕ
inst✝ : Addition ℕ
n₁ n₂✝ m n₂ : ℕ
⊢ 0 ≃ 0 → 0 + m ≃ 0 + m
ℕ : Type
inst✝² : Core ℕ
inst✝¹ : Induction ℕ
inst✝ : Addition ℕ
n₁ n₂✝ m n₂ : ℕ
x✝ : 0 ≃ 0
⊢ 0 + m ≃ 0 + m