have := hcoprime.isUnit_of_dvd' hre him
case intro
a : ℤ√(-3)
hcoprime : IsCoprime a.re a.im
heven : Even a.norm
this : Even a.re ↔ Even a.im
hre : 2 ∣ a.re
him : 2 ∣ a.im
⊢ False
case intro
a : ℤ√(-3)
hcoprime : IsCoprime a.re a.im
heven : Even a.norm
this✝ : Even a.re ↔ Even a.im
hre : 2 ∣ a.re
him : 2 ∣ a.im
this : IsUnit 2
⊢ False