Theorem: p_dvd_a_iff (FltRegular/CaseII/InductionStep.lean)

State before:
K : Type u_1
p : ℕ+
hpri : Fact p.Prime
inst✝³ : Field K
inst✝² : NumberField K
inst✝¹ : IsCyclotomicExtension {p} ℚ K
hp : p ≠ 2
inst✝ : Fintype (ClassGroup (𝓞 K))
hreg : (↑p).Coprime (Fintype.card (ClassGroup (𝓞 K)))
ζ : K
hζ : IsPrimitiveRoot ζ ↑p
x y z : 𝓞 K
ε : (𝓞 K)ˣ
m : ℕ
e : x ^ ↑p + y ^ ↑p = ↑ε * (π ^ (m + 1) * z) ^ ↑p
hy : ¬π ∣ y
hz : ¬π ∣ z
η : { x // x ∈ nthRootsFinset (↑p) (𝓞 K) }
⊢ 𝔭 ∣ 𝔞 η ↔ η = η₀
Tactic:
rw [← p_dvd_c_iff hp hζ e hy, ← root_div_zeta_sub_one_dvd_gcd_spec,
  hζ.prime_span_sub_one.dvd_pow_iff_dvd hpri.out.ne_zero]
State after:
no goals