Module

PrimaryTorsion.lean

Nyll.ProCGroups.Abelian.PrimaryTorsion
1 declaration indexed from sourceView source ↗

Prime torsion is detected by the corresponding primary quotient

Declarations

ProCGroups.ProC.eq_one_of_prime_torsion_of_primaryQuotient_eq_one

Elements killed by a prime inject into the maximal pro-prime quotient.

Source context 2 commands

Surrounding namespaces, section variables, and local commands at this declaration.

namespace ProCGroups.ProC
universe u
theorem eq_one_of_prime_torsion_of_primaryQuotient_eq_one
    {p : ℕ} [Fact p.Prime]
    {A : Type u} [CommGroup A] [TopologicalSpace A] [IsTopologicalGroup A]
    [CompactSpace A] [T2Space A] [TotallyDisconnectedSpace A]
    (a : A) (ha : a ^ p = 1)
    (hπ : QuotientGroup.mk' (proCResidualCore (FiniteGroupClass.pGroup p) A) a = 1) :
    a = 1