have : Even a.re ↔ Even a.im := by simpa [Zsqrtd.norm_def, parity_simps] using heven
a : ℤ√(-3)
hcoprime : IsCoprime a.re a.im
heven : Even (Zsqrtd.norm a)
⊢ ¬Even a.re ∧ ¬Even a.im
a : ℤ√(-3)
hcoprime : IsCoprime a.re a.im
heven : Even (Zsqrtd.norm a)
this : Even a.re ↔ Even a.im
⊢ ¬Even a.re ∧ ¬Even a.im