Module

NormalizationAbsoluteResidueAction.lean

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

The actual absolute residue coefficient square

The original decomposition morphism to the separable residue Galois group acts through the same literal quotient ring action used by the tame character.

Declarations

EtaleFundamentalGroups.Inertia.normalizationAbsoluteResidueMorphism_commutes

Applying the original absolute residue morphism and then the coefficient inclusion is the same as applying the original literal quotient action.

Source context 4 commands

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

noncomputable section
namespace EtaleFundamentalGroups.Inertia
open SchemeTheory
universe u v w
theorem normalizationAbsoluteResidueMorphism_commutes
    (A : Type u) (K : Type v) (Ω : Type w)
    [CommRing A] [IsDomain A] [IsDiscreteValuationRing A]
    [Field K] [Field Ω] [Algebra A K] [IsFractionRing A K]
    [Algebra K Ω] [Algebra A Ω] [IsScalarTower A K Ω] [IsSepClosure K Ω]
    (Q : Ideal (normalizationCommAlgCat A Ω).carrier) [Q.IsMaximal]
    (d : (normalizationDecompositionGroup A K Ω Q).carrier)
    (z : (nativeSeparableResidueField (IsLocalRing.ResidueField A)
      (normalizationResidueFieldObject A Ω Q) (normalizationResidueFieldAlgebra A Ω Q)).α) :
    nativeSeparableResidueActionScalar (IsLocalRing.ResidueField A)
        (normalizationResidueFieldObject A Ω Q) (normalizationResidueFieldAlgebra A Ω Q)
        ((normalizationAbsoluteResidueMorphism A K Ω Q).hom'.toFun d) z =
      actualNormalizationQuotientActionScalar A K Ω Q d
        (nativeSeparableResidueScalar (IsLocalRing.ResidueField A)
          (normalizationResidueFieldObject A Ω Q) (normalizationResidueFieldAlgebra A Ω Q) z)