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feat(Algebra/Homology): quasi-isomorphisms are stable under retracts and have the 2/3 property #20221

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feat(Algebra/Homology): quasi-isomorphisms are stable under retracts and have the 2/3 property #20221

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@joelriou joelriou added the t-category-theory Category theory label Dec 24, 2024
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PR summary 5bda596d42

Import changes for modified files

Dependency changes

File Base Count Head Count Change
Mathlib.Algebra.Homology.QuasiIso 973 976 +3 (+0.31%)
Import changes for all files
Files Import difference
18 files Mathlib.RepresentationTheory.GroupCohomology.Hilbert90 Mathlib.Algebra.Homology.DerivedCategory.HomologySequence Mathlib.CategoryTheory.Abelian.Ext Mathlib.CategoryTheory.Sites.SheafCohomology.Basic Mathlib.Algebra.Homology.DerivedCategory.Ext.Basic Mathlib.RepresentationTheory.GroupCohomology.Resolution Mathlib.Algebra.Homology.DerivedCategory.Ext.ExactSequences Mathlib.Algebra.Homology.DerivedCategory.SingleTriangle Mathlib.Algebra.Homology.DerivedCategory.ShortExact Mathlib.Algebra.Homology.Localization Mathlib.RepresentationTheory.GroupCohomology.Basic Mathlib.Algebra.Homology.LocalCohomology Mathlib.Algebra.Homology.HomotopyCategory.ShiftSequence Mathlib.RepresentationTheory.GroupCohomology.LowDegree Mathlib.Algebra.Homology.HomotopyCategory.ShortExact Mathlib.Algebra.Homology.DerivedCategory.Basic Mathlib.Algebra.Homology.DerivedCategory.ExactFunctor Mathlib.Algebra.Homology.DerivedCategory.Ext.ExtClass
 2
9 files Mathlib.CategoryTheory.Abelian.RightDerived Mathlib.CategoryTheory.Abelian.ProjectiveResolution Mathlib.CategoryTheory.Monoidal.Tor Mathlib.Algebra.Homology.HomologySequenceLemmas Mathlib.CategoryTheory.Preadditive.ProjectiveResolution Mathlib.Algebra.Homology.QuasiIso Mathlib.CategoryTheory.Abelian.InjectiveResolution Mathlib.CategoryTheory.Preadditive.InjectiveResolution Mathlib.CategoryTheory.Abelian.LeftDerived
 3
Mathlib.Algebra.Homology.ShortComplex.Retract (new file) 572

Declarations diff

+ instance : (quasiIso C c).HasTwoOutOfThreeProperty
+ instance : (quasiIso C c).IsMultiplicative
+ instance : (quasiIso C c).IsStableUnderRetracts
+ instance : (quasiIso C c).RespectsIso
+ quasiIsoAt_of_retract
+ quasiIso_of_retract
+ quasiIso_of_retractArrow

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).

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