Theorems · Theorem · number theory

IsPrimitiveRoot.norm_sub_one_of_prime_ne_two

∀ {p : ℕ} {K : Type u} {L : Type v} [inst : Field L] {ζ : L} [inst_1 : Field K] [inst_2 : Algebra K L] {k : ℕ},
  IsPrimitiveRoot ζ (p ^ (k + 1)) →
    ∀ [hpri : Fact (Nat.Prime p)] [IsCyclotomicExtension {p ^ (k + 1)} K L],
      Irreducible (Polynomial.cyclotomic (p ^ (k + 1)) K) → p ≠ 2 → (Algebra.norm K) (ζ - 1) = ↑p

If Irreducible (cyclotomic (p ^ (k + 1)) K) (in particular for K = ℚ) and p is an odd prime, then the norm of ζ - 1 is p.

Defined in

Mathlib.NumberTheory.Cyclotomic.PrimitiveRoots

Cited by

3 results in Mathlib

Foundations

Depth 218 from the axioms · uses propext, Classical.choice, Quot.sound

Assumes

FieldFieldAlgebraFactIsCyclotomicExtension