intro (_ : 0 ≃ (0 : ℕ))
ℕ : Type
inst✝⁵ : Core ℕ
inst✝⁴ : Induction ℕ
inst✝³ : Addition ℕ
inst✝² : Sign ℕ
inst✝¹ : Order ℕ
inst✝ : Multiplication ℕ
n₁ n₂✝ m n₂ : ℕ
⊢ 0 ≃ 0 → 0 * m ≃ 0 * m
ℕ : Type
inst✝⁵ : Core ℕ
inst✝⁴ : Induction ℕ
inst✝³ : Addition ℕ
inst✝² : Sign ℕ
inst✝¹ : Order ℕ
inst✝ : Multiplication ℕ
n₁ n₂✝ m n₂ : ℕ
x✝ : 0 ≃ 0
⊢ 0 * m ≃ 0 * m