simp [Algebra.coe_norm_int, hζ.sub_one_norm_two']
case a
K : Type u_1
inst✝² : Field K
inst✝¹ : CharZero K
ζ : K
hpri : Fact (PNat.Prime 2)
inst✝ : IsCyclotomicExtension {2} ℚ K
hζ : IsPrimitiveRoot ζ ↑2
this✝ : NumberField K := IsCyclotomicExtension.numberField {2} ℚ K
this : Fact (↑2).Prime
⊢ (algebraMap ℤ ℚ) ((Algebra.norm ℤ) (↑hζ.unit' - 1)) = (algebraMap ℤ ℚ) (-↑↑2)
no goals