have : ¬(n ≃ 0 ∨ m ≃ 0) := Logic.not_or_iff_and_not.mpr this
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
n m : ℕ
left✝ : Positive n
right✝ : Positive m
this✝¹ : n ≄ 0
this✝ : m ≄ 0
this : n ≄ 0 ∧ m ≄ 0
⊢ Positive (n * 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
n m : ℕ
left✝ : Positive n
right✝ : Positive m
this✝² : n ≄ 0
this✝¹ : m ≄ 0
this✝ : n ≄ 0 ∧ m ≄ 0
this : ¬(n ≃ 0 ∨ m ≃ 0)
⊢ Positive (n * m)