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