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[Merged by Bors] - feat(CategoryTheory/Abelian): the exact sequence attached to a pushout square #22110

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[Merged by Bors] - feat(CategoryTheory/Abelian): the exact sequence attached to a pushout square #22110

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@joelriou joelriou commented Feb 20, 2025 •
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We attach an exact sequence X₁ ⟶ X₂ ⊞ X₃ ⟶ X₄ ⟶ 0 to a pushout square.

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@joelriou joelriou added the t-category-theory Category theory label Feb 20, 2025
@joelriou joelriou mentioned this pull request Feb 20, 2025
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PR summary ac998a920a

Import changes for modified files

No significant changes to the import graph

Import changes for all files
Files Import difference
Mathlib.Algebra.Homology.CommSq Mathlib.Algebra.Homology.Square 1
Mathlib.CategoryTheory.Abelian.CommSq (new file) 878

Declarations diff

+ CommSq.shortComplex
+ CommSq.shortComplex'
+ IsPullback.mono_shortComplex'_f
+ IsPushout.epi_shortComplex_g
+ exact_shortComplex
+ exact_shortComplex'
+ hom_eq_add_up_to_refinements

You can run this locally as follows 
## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for script/declarations_diff.sh contains some details about this script.

No changes to technical debt.

You can run this locally as

./scripts/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).

@joelriou joelriou added the WIP Work in progress label Feb 20, 2025
@joelriou joelriou removed the WIP Work in progress label Feb 20, 2025
TwoFX
TwoFX approved these changes Feb 20, 2025
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Thanks!
bors d+

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mathlib-bors bot commented Feb 20, 2025

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

@leanprover-community-mathlib4-bot leanprover-community-mathlib4-bot added the delegated This pull request has been delegated to the PR author (or occasionally another non-maintainer). label Feb 20, 2025
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joelriou commented Feb 20, 2025

Thanks!

bors merge

@leanprover-community-mathlib4-bot leanprover-community-mathlib4-bot added the ready-to-merge This PR has been sent to bors. label Feb 20, 2025
mathlib-bors bot pushed a commit that referenced this pull request Feb 20, 2025
@joelriou
feat(CategoryTheory/Abelian): the exact sequence attached to a pushou…
022c5bb 
…t square (#22110)

We attach an exact sequence `X₁ ⟶ X₂ ⊞ X₃ ⟶ X₄ ⟶ 0` to a pushout square.
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mathlib-bors bot commented Feb 20, 2025

Pull request successfully merged into master.

Build succeeded:

@mathlib-bors mathlib-bors bot changed the title feat(CategoryTheory/Abelian): the exact sequence attached to a pushout square [Merged by Bors] - feat(CategoryTheory/Abelian): the exact sequence attached to a pushout square Feb 20, 2025
@mathlib-bors mathlib-bors bot closed this Feb 20, 2025
@mathlib-bors mathlib-bors bot deleted the jriou-preadditive-commsq branch February 20, 2025 10:03
Julian added a commit that referenced this pull request Feb 21, 2025
@Julian
Merge remote-tracking branch 'origin/master' into polynomial-sequences
05a9447 
* origin/master: (823 commits)
  chore(Computability): fix naming of lemmas about Sum.inl, Sum.inr, Sum.casesOn (#22156)
  feat: `Fintype Ordering` (#22154)
  chore: more renamings to fit the naming convention (#22148)
  feat(CategoryTheory): any monomorphism in a Grothendieck abelian category is a transfinite composition of pushouts of monomorphisms in a small family (#22157)
  chore: rename `{Continuous., continuous_}sum_map` to `sumMap` (#22155)
  chore: remove initial space followed by `-/` (#22158)
  chore: make arg in HeightOneSpectrum.valuation explicit (#22139)
  feat(Data/List): `List.maximum` is monotone (#22091)
  chore(Combinatorics/SimpleGraph): extract WalkDecomp from Walk (#21981)
  feat: if a monoid M acts, then so does (s : S) with [SubmonoidClass S M] (#21123)
  chore: backport changes to `getElem` lemmas (#22146)
  feat(CategoryTheory): generating monomorphisms in Grothendieck abelian categories (#22150)
  feat: rename variables to fit doc (#22143)
  feat(CategoryTheory): IsDetecting.isIso_iff_of_mono (#22135)
  feat(CategoryTheory): truncations of transfinite compositions (#22149)
  chore: simplify a proof (#22134)
  feat(CategoryTheory): monomorphisms are stable under coproducts in Grothendieck abelian categories (#22133)
  feat(Order): Set.Ici.isSuccLimit_coe (#22103)
  chore(Analysis/Convex/Normed): split into smaller files (#22015)
  feat(Algebra/Algebra/Lie): max nilpotent ideal <= radical (#22140)
  refactor(LinearIndependent): refactor to use LinearIndepOn (#21886)
  chore: rename some more `Foo.sum_elim` -> `sumElim` (#22130)
  chore: rename Injective.sum_elim and friends (#22129)
  chore: fix naming oversight from #22070 (#22128)
  chore: fix spelling mistakes (#22136)
  feat(RingTheory/Ideal/Quotient): define transtition map between ring or module quotient by powers of ideal (#21900)
  fix: initialize_simps_projections print warning when projection data already exists (#20339)
  chore: rename ContMDiff.sum_{elim,map} (#22131)
  feat(CategoryTheory): characterization of injective objects in terms of lifting properties (#22104)
  chore(Lean,Tactic): un-indent some doc-strings (#22118)
  feat(Algebra/MvPolynomial): add `comp` versions of rename lemmas (#21259)
  chose: add deprecation (#22124)
  feat(CategoryTheory/Abelian/GrothendieckCategory): computing colimits in Subobject (#22123)
  feat(CategoryTheory/Subobject): hasCardinalLT_of_mono (#22122)
  feat: add `DenseRange.piMap` (#22114)
  feat(Algebra/Algebra/Lie): define the maximal nilpotent ideal of Lie algebras (#22061)
  chore(Data/Finset): don't import algebra when defining `Finset.card` (#21866)
  feat: a function on a discrete space is smooth (#22113)
  feat: commutative group objects in additive categories (#21521)
  style(Geometry/Manifold): remove superfluous indentation in doc-strings (#22117)
  chore: rename PushNeg.lean to Push.lean (#22108)
  feat: add Is{Open,Closed}Embedding.sum_elim (#22070)
  feat(RingTheory/Perfectoid): define the untilt map and generalize pretilt (#21563)
  feature(Topology/Algebra/Module/WeakBilin): Linear map from F into the topological dual of E with the weak topology (#21078)
  feat(CategoryTheory/Abelian): the exact sequence attached to a pushout square (#22110)
  chore(ChartedSpace.lean): group constructions together (#22107)
  feat(CategoryTheory/MorphismProperty): more basic API (#22099)
  chore(Data/Fintype): split `Fintype/Card.lean` (#21840)
  chore(SetTheory/Cardinal/Cofinality): make `IsStrongLimit` into a structure (#21971)
  feat(Combinatorics/SimpleGraph): Add a theorem about cliques in induced subgraphs (#20705)
  ...
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