Module

ActualFiniteNormalizationConjugateRingHom.lean

Nyll.EtaleFundamentalGroups.Inertia.ActualFiniteNormalizationConjugateRingHom
1 declaration indexed from sourceView source ↗

Conjugation under the actual full-Galois normalization restriction

The actual coefficient homomorphism preserves group multiplication. This calculation is proved before an upper prime or D/I group is introduced.

Declarations

EtaleFundamentalGroups.Inertia.actualFiniteNormalizationRestrictionRingHom_conjugate
Source context 3 commands

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

namespace EtaleFundamentalGroups.Inertia
open SchemeTheory
universe u v w
theorem actualFiniteNormalizationRestrictionRingHom_conjugate
    (A : Type u) (K : Type v) (L : Type w)
    [CommRing A] [Field K] [Field L]
    [Algebra A K] [IsFractionRing A K]
    [Algebra K L] [Algebra A L] [IsScalarTower A K L] [IsGalois K L]
    (E : FiniteGaloisIntermediateField K L) (g s : Gal(L/K)) :
    actualFiniteNormalizationRestrictionRingHom A K L E (g * s * g⁻¹) =
      (actualFiniteNormalizationRestrictionRingHom A K L E g).comp
        ((actualFiniteNormalizationRestrictionRingHom A K L E s).comp
          (actualFiniteNormalizationRestrictionRingHom A K L E g⁻¹))