exact this
ℕ ℤ ℚ : Type
inst✝⁹ : Natural ℕ
inst✝⁸ : Integer ℤ
inst✝⁷ : Core ℚ
inst✝⁶ : Addition ℚ
inst✝⁵ : Multiplication ℚ
inst✝⁴ : Negation ℚ
inst✝³ : Subtraction ℚ
inst✝² : Reciprocation ℚ
inst✝¹ : Division ℚ
inst✝ : Sign ℚ
p q : ℚ
x✝ : p * q ≃ 0
this✝¹ : sgn p * sgn q ≃ 0
this✝ : sgn p ≃ 0 ∨ sgn q ≃ 0
this : p ≃ 0 ∨ q ≃ 0
⊢ p ≃ 0 ∨ q ≃ 0
no goals