contradiction
case intro.intro.intro.intro.refine'_3.nonzero.intro
p q : ℤ
hp : p ≠ 0
hcoprime : IsCoprime p q
hparity : Even p ↔ ¬Even q
u : ℤ
hu : p ^ 2 + 3 * q ^ 2 = u ^ 3
hq' : q = 3 * 0 ^ 2 * 0 - 3 * 0 ^ 3
hp' : p = 0
⊢ False
no goals