exact Nonzero.mk ‹NonzeroWithSign (a * b) (as * bs)›
ℕ : Type
inst✝⁴ : Natural ℕ
ℤ : Type
inst✝³ : Core ℤ
inst✝² : Addition ℤ
inst✝¹ : Multiplication ℤ
inst✝ : Negation ℤ
a b as : ℤ
sqrt1✝¹ : Sqrt1 as
nwsa : NonzeroWithSign a as
bs : ℤ
sqrt1✝ : Sqrt1 bs
nwsb : NonzeroWithSign b bs
this✝¹ : NonzeroWithSign a as
this✝ : NonzeroWithSign b bs
this : NonzeroWithSign (a * b) (as * bs)
⊢ Nonzero (a * b)
no goals