case a
n : ℕ
P : ℤ[X]
h : map (Int.castRingHom ℂ) P = cyclotomic' n ℂ
⊢ map (Int.castRingHom ℂ) P = map (Int.castRingHom ℂ) (cyclotomic n ℤ)
n : ℕ
P : ℤ[X]
h : map (Int.castRingHom ℂ) P = cyclotomic' n ℂ
⊢ P = cyclotomic n ℤ
apply map_injective (Int.castRingHom ℂ) Int.cast_injective
no goals
case a
n : ℕ
P : ℤ[X]
h : map (Int.castRingHom ℂ) P = cyclotomic' n ℂ
⊢ map (Int.castRingHom ℂ) P = map (Int.castRingHom ℂ) (cyclotomic n ℤ)
rw [h, (int_cyclotomic_spec n).1]