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[Merged by Bors] - feat(LinearAlgebra/Matrix/SpecialLinearGroup): Add action on R^n#39581

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[Merged by Bors] - feat(LinearAlgebra/Matrix/SpecialLinearGroup): Add action on R^n#39581
Whysoserioushah wants to merge 3 commits into
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Whysoserioushah:edison/projgeo1

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PR summary 5e6db46a60

Import changes for modified files

Dependency changes

File Base Count Head Count Change
Mathlib.LinearAlgebra.Matrix.SpecialLinearGroup 1471 1472 +1 (+0.07%)
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1143 files Mathlib.Algebra.Category.ModuleCat.ExteriorPower Mathlib.Algebra.Lie.AdjointAction.Basic Mathlib.Algebra.Lie.AdjointAction.JordanChevalley Mathlib.Algebra.Lie.Basis Mathlib.Algebra.Lie.CartanCriterion Mathlib.Algebra.Lie.CartanExists Mathlib.Algebra.Lie.Classical Mathlib.Algebra.Lie.Derivation.Killing Mathlib.Algebra.Lie.EngelSubalgebra Mathlib.Algebra.Lie.Engel Mathlib.Algebra.Lie.Killing Mathlib.Algebra.Lie.LieTheorem Mathlib.Algebra.Lie.Matrix Mathlib.Algebra.Lie.Rank Mathlib.Algebra.Lie.Semisimple.Lemmas Mathlib.Algebra.Lie.SkewAdjoint Mathlib.Algebra.Lie.Sl2 Mathlib.Algebra.Lie.TraceForm Mathlib.Algebra.Lie.Weights.Basic Mathlib.Algebra.Lie.Weights.Cartan Mathlib.Algebra.Lie.Weights.Chain Mathlib.Algebra.Lie.Weights.IsSimple Mathlib.Algebra.Lie.Weights.Killing Mathlib.Algebra.Lie.Weights.Linear Mathlib.Algebra.Lie.Weights.RootSystem Mathlib.Algebra.Module.LinearMap.Polynomial Mathlib.Algebra.Module.StablyFree.FreeOfInvertible 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1

Declarations diff

+ SpecialLinearGroup.smul_def
+ instance : DistribMulAction (Matrix.SpecialLinearGroup ι F) (ι → F)
+ instance : SMulCommClass (Matrix.SpecialLinearGroup ι F) F (ι → F)

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.


No changes to strong technical debt.
No changes to weak technical debt.

@github-actions github-actions Bot added the t-algebra Algebra (groups, rings, fields, etc) label May 19, 2026
@Whysoserioushah Whysoserioushah added the easy < 20s of review time. See the lifecycle page for guidelines. label May 19, 2026
@b-mehta

b-mehta commented May 19, 2026

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This looks good to me but it's not my area so

maintainer merge

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🚀 Pull request has been placed on the maintainer queue by b-mehta.

@mathlib-triage mathlib-triage Bot added the maintainer-merge A reviewer has approved the changed; awaiting maintainer approval. label May 19, 2026
Comment thread Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean

@riccardobrasca riccardobrasca left a comment

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Thanks!

bors d+

Comment thread Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean
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mathlib-bors Bot commented May 22, 2026

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✌️ Whysoserioushah can now approve this pull request. To approve and merge a pull request, simply reply with bors r+. More detailed instructions are available here.

@mathlib-triage mathlib-triage Bot added delegated This pull request has been delegated to the PR author (or occasionally another non-maintainer). and removed maintainer-merge A reviewer has approved the changed; awaiting maintainer approval. labels May 22, 2026
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bors r+

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Can you use DistribMulAction.compHom directly here?

Comment thread Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean Outdated
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bors r-

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mathlib-bors Bot commented May 22, 2026

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Canceled.

Address comments or fix if necessary, and then someone with permission can run bors r+.

@mathlib-triage mathlib-triage Bot removed the delegated This pull request has been delegated to the PR author (or occasionally another non-maintainer). label May 22, 2026
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After further investigation DistribMulAction.compHom is a bad idea, so let's just merge this. But I really think the lemma should be called smul_def. If you think it may be confusing let's just protect it.

bors d+

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✌️ Whysoserioushah can now approve this pull request. To approve and merge a pull request, simply reply with bors r+. More detailed instructions are available here.

@mathlib-triage mathlib-triage Bot added the delegated This pull request has been delegated to the PR author (or occasionally another non-maintainer). label May 22, 2026
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bors r+

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mathlib-bors Bot commented May 22, 2026

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Pull request successfully merged into master.

Build succeeded:

@mathlib-bors mathlib-bors Bot changed the title feat(LinearAlgebra/Matrix/SpecialLinearGroup): Add action on R^n [Merged by Bors] - feat(LinearAlgebra/Matrix/SpecialLinearGroup): Add action on R^n May 22, 2026
@mathlib-bors mathlib-bors Bot closed this May 22, 2026
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