exact hb ▸ dvd_zero a
case pos
K : Type u_1
p : ℕ+
hpri : Fact p.Prime
inst✝⁵ : Field K
inst✝⁴ : CharZero K
inst✝³ : IsCyclotomicExtension {p} ℚ K
ζ : K
hζ : IsPrimitiveRoot ζ ↑p
M : Type u_2
inst✝² : CancelCommMonoidWithZero M
inst✝¹ : DecidableRel fun a b => a ∣ b
inst✝ : UniqueFactorizationMonoid M
a b : M
ha : a ≠ 0
H : ∀ (p : M), Prime p → multiplicity p a ≤ multiplicity p b
hb : b = 0
⊢ a ∣ b
no goals