apply Integer.NonzeroWithSign.intro n ‹Positive n›
x : ℤ
mul_ident : AA.Identity (coe 1) fun x x_1 => x * x_1
n : ℕ
left✝ : Positive n
right✝ : x ≃ coe n
⊢ Integer.NonzeroWithSign x 1
x : ℤ
mul_ident : AA.Identity (coe 1) fun x x_1 => x * x_1
n : ℕ
left✝ : Positive n
right✝ : x ≃ coe n
⊢ x ≃ 1 * coe n