have : Positive (n * m) := positive_defn.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✝³ : n ≄ 0
this✝² : m ≄ 0
this✝¹ : n ≄ 0 ∧ m ≄ 0
this✝ : ¬(n ≃ 0 ∨ m ≃ 0)
this : n * 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✝⁴ : n ≄ 0
this✝³ : m ≄ 0
this✝² : n ≄ 0 ∧ m ≄ 0
this✝¹ : ¬(n ≃ 0 ∨ m ≃ 0)
this✝ : n * m ≄ 0
this : Positive (n * m)
⊢ Positive (n * m)