Module

ResidualOrdinaryFaithfulness.lean

Nyll.ProCGroups.ProC.MaximalQuotients.ResidualOrdinaryFaithfulness
1 declaration indexed from sourceView source ↗

Ordinary faithfulness detected on a residual abelianization

The canonical projection from a group to its residual quotient induces a map on topological abelianizations. Equality under ordinary conjugation therefore implies equality under the actual residual conjugation action.

Declarations

ProCGroups.ProC.quotientConjugationTopologicalAbelianizationMap_injective_of_residual

Faithfulness on an abelianized residual quotient implies ordinary abelianization-faithfulness of the same relative quotient.

Source context 3 commands

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

namespace ProCGroups.ProC
open ProCGroups.Abelian
universe u
theorem quotientConjugationTopologicalAbelianizationMap_injective_of_residual
    {C : FiniteGroupClass.{u}} {G : Type u}
    [Group G] [TopologicalSpace G] [IsTopologicalGroup G]
    [CompactSpace G] [T2Space G] [TotallyDisconnectedSpace G]
    (hC : FiniteGroupClass.FullFormation C)
    (N : Subgroup G) [N.Normal] (hN : IsClosed (N : Set G))
    (hfaith : Function.Injective (residualAbelianizationQuotientConjugation hC N hN)) :
    Function.Injective (quotientConjugationTopologicalAbelianizationMap N)