rintro ⟨hre, him⟩
a : ℤ√(-3)
hcoprime : IsCoprime a.re a.im
heven : Even (Zsqrtd.norm a)
this : Even a.re ↔ Even a.im
⊢ ¬(2 ∣ a.re ∧ 2 ∣ a.im)
case intro
a : ℤ√(-3)
hcoprime : IsCoprime a.re a.im
heven : Even (Zsqrtd.norm a)
this : Even a.re ↔ Even a.im
hre : 2 ∣ a.re
him : 2 ∣ a.im
⊢ False