Module

OriginalFiniteNormalizationInertiaConjugate.lean

Nyll.EtaleFundamentalGroups.Inertia.OriginalFiniteNormalizationInertiaConjugate
2 declarations indexed from sourceView source ↗

Conjugation of original finite-field inertia

Defines the original finite-field inertia conjugate and identifies its underlying element with the original field-automorphism expression.

Declarations

EtaleFundamentalGroups.Inertia.originalFiniteNormalizationInertiaConjugate

The original field-inertia conjugate, with its prescribed action closed inside the original normalization owner.

Source context 5 commands

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

noncomputable section
namespace EtaleFundamentalGroups.Inertia
open SchemeTheory
universe u v w
attribute [local instance] normalizationCommAlgGaloisAction
def originalFiniteNormalizationInertiaConjugate
    (A : Type u) (K : Type v) (F : Type w)
    [CommRing A] [Field K] [Field F]
    [Algebra A K] [IsFractionRing A K]
    [Algebra K F] [Algebra A F] [IsScalarTower A K F] [IsGalois K F]
    (Q : Ideal (normalizationCommAlgCat A F))
    (d : normalizationDecompositionGroup A K F Q)
    (σ : actualNormalizationInertiaGroup A K F Q) :
    actualNormalizationInertiaGroup A K F Q
EtaleFundamentalGroups.Inertia.originalFiniteNormalizationInertiaConjugate_element

The native original conjugate is exactly the original field expression.

Source context 5 commands

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

noncomputable section
namespace EtaleFundamentalGroups.Inertia
open SchemeTheory
universe u v w
attribute [local instance] normalizationCommAlgGaloisAction
theorem originalFiniteNormalizationInertiaConjugate_element
    (A : Type u) (K : Type v) (F : Type w)
    [CommRing A] [Field K] [Field F]
    [Algebra A K] [IsFractionRing A K]
    [Algebra K F] [Algebra A F] [IsScalarTower A K F] [IsGalois K F]
    (Q : Ideal (normalizationCommAlgCat A F))
    (d : normalizationDecompositionGroup A K F Q)
    (σ : actualNormalizationInertiaGroup A K F Q) :
    actualNormalizationInertiaElement A K F Q
        (originalFiniteNormalizationInertiaConjugate A K F Q d σ) =
      (normalizationDecompositionInclusion A K F Q).toFun d *
        actualNormalizationInertiaElement A K F Q σ *
        ((normalizationDecompositionInclusion A K F Q).toFun d)⁻¹