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feat(RingTheory/Localization/FractionRing): add IsFractionRing.fixingSubgroup_range_algebraMap#40864

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feat(RingTheory/Localization/FractionRing): add IsFractionRing.fixingSubgroup_range_algebraMap#40864
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@xroblot xroblot commented Jun 21, 2026

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Adds IsFractionRing.fixingSubgroup_range_algebraMap: if K and L are the fraction fields of A and B with A ⊆ B, then for G acting on B and on L, the fixing subgroup of (the image of) A in B equals the fixing subgroup of K in L.

This lemma was split out of #38864, and is used here to golf the proof of IsGaloisGroup.fixingSubgroup_range_algebraMap.

@github-actions github-actions Bot added the t-ring-theory Ring theory label Jun 21, 2026
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PR summary 8749089eb3

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Mathlib.RingTheory.Localization.FractionRing 941 947 +6 (+0.64%)
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Mathlib.RingTheory.Polynomial.Morse 1
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Mathlib.RingTheory.DedekindDomain.Dvr Mathlib.RingTheory.DedekindDomain.Factorization Mathlib.RingTheory.DedekindDomain.Ideal.Basic Mathlib.RingTheory.DedekindDomain.Ideal.Lemmas Mathlib.RingTheory.DedekindDomain.Instances Mathlib.RingTheory.DedekindDomain.PID Mathlib.RingTheory.Derivation.MapCoeffs Mathlib.RingTheory.DiscreteValuationRing.Basic Mathlib.RingTheory.DiscreteValuationRing.TFAE Mathlib.RingTheory.DividedPowers.Padic Mathlib.RingTheory.Etale.Basic Mathlib.RingTheory.Etale.Kaehler Mathlib.RingTheory.Etale.Locus Mathlib.RingTheory.Etale.Pi Mathlib.RingTheory.Etale.StandardEtale Mathlib.RingTheory.Etale.Weakly Mathlib.RingTheory.Extension.Cotangent.BaseChange Mathlib.RingTheory.Extension.Cotangent.Basic Mathlib.RingTheory.Extension.Cotangent.Basis Mathlib.RingTheory.Extension.Cotangent.Free Mathlib.RingTheory.Extension.Cotangent.LocalizationAway Mathlib.RingTheory.Extension.ExtendScalars Mathlib.RingTheory.Extension.Presentation.Basic 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2
113 files Mathlib.Algebra.Algebra.Epi Mathlib.Algebra.AlgebraicCard Mathlib.Algebra.Category.ModuleCat.Localization Mathlib.Algebra.Category.Ring.Epi Mathlib.Algebra.CharP.Algebra Mathlib.Algebra.CharP.IntermediateField Mathlib.Algebra.CharP.Subring Mathlib.Algebra.CubicDiscriminant Mathlib.Algebra.Lie.CartanSubalgebra Mathlib.Algebra.Lie.Character Mathlib.Algebra.Lie.InvariantForm Mathlib.Algebra.Lie.Loop Mathlib.Algebra.Lie.Nilpotent Mathlib.Algebra.Lie.Semisimple.Basic Mathlib.Algebra.Lie.Semisimple.Defs Mathlib.Algebra.Lie.Solvable Mathlib.Algebra.Module.FinitePresentation Mathlib.Algebra.Module.Lattice Mathlib.Algebra.Module.LocalizedModule.Submodule Mathlib.Algebra.Module.Presentation.Finite Mathlib.Algebra.MvPolynomial.Expand Mathlib.Algebra.MvPolynomial.Funext Mathlib.Algebra.MvPolynomial.Nilpotent Mathlib.Algebra.MvPolynomial.NoZeroDivisors Mathlib.Algebra.MvPolynomial.SchwartzZippel Mathlib.Algebra.Polynomial.Degree.CardPowDegree Mathlib.Algebra.Polynomial.FieldDivision Mathlib.Algebra.Polynomial.Homogenize Mathlib.Algebra.Polynomial.Roots Mathlib.Algebra.Polynomial.RuleOfSigns Mathlib.Algebra.Polynomial.SpecificDegree Mathlib.Algebra.Polynomial.Splits Mathlib.AlgebraicGeometry.EllipticCurve.Affine.AddSubMap Mathlib.AlgebraicGeometry.EllipticCurve.ModelsWithJ Mathlib.AlgebraicGeometry.EllipticCurve.NormalForms Mathlib.AlgebraicGeometry.EllipticCurve.VariableChange Mathlib.AlgebraicGeometry.EllipticCurve.Weierstrass Mathlib.Combinatorics.Additive.VerySmallDoubling Mathlib.Combinatorics.Nullstellensatz Mathlib.FieldTheory.MvRatFunc.Rank Mathlib.FieldTheory.RatFunc.Defs Mathlib.GroupTheory.DivisibleHull Mathlib.LinearAlgebra.Dimension.Localization Mathlib.LinearAlgebra.LinearIndependent.BaseChange Mathlib.ModelTheory.Arithmetic.Presburger.Definability Mathlib.ModelTheory.Arithmetic.Presburger.Semilinear.Basic Mathlib.NumberTheory.DiophantineApproximation.Basic Mathlib.NumberTheory.DiophantineApproximation.ContinuedFractions Mathlib.NumberTheory.FLT.MasonStothers Mathlib.NumberTheory.Rayleigh Mathlib.NumberTheory.Real.GoldenRatio Mathlib.NumberTheory.Real.Irrational Mathlib.RingTheory.Algebraic.Basic Mathlib.RingTheory.Algebraic.Cardinality Mathlib.RingTheory.Algebraic.MvPolynomial Mathlib.RingTheory.AlgebraicIndependent.Transcendental Mathlib.RingTheory.Artinian.Instances Mathlib.RingTheory.Bialgebra.GroupLike Mathlib.RingTheory.Coalgebra.GroupLike Mathlib.RingTheory.Finiteness.FiniteTypeLocal Mathlib.RingTheory.Flat.Domain Mathlib.RingTheory.Flat.FaithfullyFlat.Basic Mathlib.RingTheory.Flat.Localization Mathlib.RingTheory.Flat.Stability Mathlib.RingTheory.FractionalIdeal.Basic Mathlib.RingTheory.FractionalIdeal.Inverse Mathlib.RingTheory.FractionalIdeal.Operations Mathlib.RingTheory.HopfAlgebra.GroupLike Mathlib.RingTheory.Ideal.AssociatedPrime.Finiteness Mathlib.RingTheory.Lasker Mathlib.RingTheory.LocalProperties.Exactness Mathlib.RingTheory.LocalProperties.FinitePresentation Mathlib.RingTheory.LocalProperties.Projective Mathlib.RingTheory.LocalProperties.Submodule Mathlib.RingTheory.Localization.Algebra Mathlib.RingTheory.Localization.AsSubring Mathlib.RingTheory.Localization.Away.Lemmas Mathlib.RingTheory.Localization.BaseChange Mathlib.RingTheory.Localization.Cardinality Mathlib.RingTheory.Localization.Finiteness Mathlib.RingTheory.Localization.FractionRing Mathlib.RingTheory.Localization.Free Mathlib.RingTheory.Localization.LocalizationLocalization Mathlib.RingTheory.Localization.Module Mathlib.RingTheory.Localization.NumDen Mathlib.RingTheory.Localization.Rat Mathlib.RingTheory.Localization.Submodule Mathlib.RingTheory.MvPolynomial.EulerIdentity Mathlib.RingTheory.MvPolynomial.Expand Mathlib.RingTheory.MvPolynomial.Groebner Mathlib.RingTheory.MvPolynomial.Homogeneous Mathlib.RingTheory.MvPolynomial.Ideal Mathlib.RingTheory.MvPolynomial.IrreducibleQuadratic Mathlib.RingTheory.MvPolynomial.Localization Mathlib.RingTheory.MvPolynomial.MonomialOrder.DegLex Mathlib.RingTheory.MvPolynomial.MonomialOrder Mathlib.RingTheory.Polynomial.ContentIdeal Mathlib.RingTheory.Polynomial.Content Mathlib.RingTheory.Polynomial.Eisenstein.Basic Mathlib.RingTheory.Polynomial.Eisenstein.Criterion Mathlib.RingTheory.Polynomial.Eisenstein.Distinguished Mathlib.RingTheory.Polynomial.HilbertPoly Mathlib.RingTheory.Polynomial.IntegralNormalization Mathlib.RingTheory.Polynomial.Radical Mathlib.RingTheory.Polynomial.ScaleRoots Mathlib.RingTheory.Polynomial.SmallDegreeVieta Mathlib.RingTheory.Polynomial.UniqueFactorization Mathlib.RingTheory.Polynomial.Vieta Mathlib.RingTheory.TensorProduct.IsBaseChangeFree Mathlib.RingTheory.TensorProduct.IsBaseChangePi Mathlib.RingTheory.TensorProduct.Nontrivial Mathlib.RingTheory.Valuation.IsTrivialOn Mathlib.RingTheory.Valuation.ValuationRing
6

Declarations diff (regex)

+ fixingSubgroup_range_algebraMap

You can run this locally as follows
## from your `mathlib4` directory:
git clone https://github.com/leanprover-community/mathlib-ci.git ../mathlib-ci

## summary with just the declaration names:
../mathlib-ci/scripts/pr_summary/declarations_diff.sh <optional_commit>

## more verbose report:
../mathlib-ci/scripts/pr_summary/declarations_diff.sh long <optional_commit>

The doc-module for scripts/pr_summary/declarations_diff.sh in the mathlib-ci repository contains some details about this script.

Declarations diff (Lean)

Lean-aware diff — post-build, computed from the Lean environment (commit 8749089).

  • +1 new declarations
  • −0 removed declarations
+IsFractionRing.fixingSubgroup_range_algebraMap

No changes to strong technical debt.

No changes to weak technical debt.

Current commit 8749089eb3
Reference commit e5836dbb05

This script lives in the mathlib-ci repository. To run it locally, from your mathlib4 directory:

git clone https://github.com/leanprover-community/mathlib-ci.git ../mathlib-ci
../mathlib-ci/scripts/reporting/technical-debt-metrics.sh pr_summary
  • The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
  • The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

@xroblot xroblot force-pushed the fixingsubgroup-fractionring branch 2 times, most recently from cc3c153 to 6f1f13b Compare June 21, 2026 13:32
@github-actions github-actions Bot added the merge-conflict The PR has a merge conflict with master, and needs manual merging. (this label is managed by a bot) label Jun 21, 2026
@mathlib-dependent-issues mathlib-dependent-issues Bot added the blocked-by-other-PR This PR depends on another PR (this label is automatically managed by a bot) label Jun 21, 2026
@xroblot xroblot force-pushed the fixingsubgroup-fractionring branch from 6f1f13b to 5d54b55 Compare June 21, 2026 13:45
@github-actions github-actions Bot removed the merge-conflict The PR has a merge conflict with master, and needs manual merging. (this label is managed by a bot) label Jun 21, 2026
…Subgroup_range_algebraMap and use it to golf IsGaloisGroup.fixingSubgroup_range_algebraMap
@xroblot xroblot force-pushed the fixingsubgroup-fractionring branch from 5d54b55 to 8749089 Compare June 21, 2026 13:58
@mathlib-dependent-issues mathlib-dependent-issues Bot removed the blocked-by-other-PR This PR depends on another PR (this label is automatically managed by a bot) label Jun 21, 2026
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