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[Merged by Bors] - feat(CategoryTheory/Shift): the shift on a full subcategory#34372

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joelriou:spectral-sequences-3-object-property-shift
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[Merged by Bors] - feat(CategoryTheory/Shift): the shift on a full subcategory#34372
joelriou wants to merge 3 commits intoleanprover-community:masterfrom
joelriou:spectral-sequences-3-object-property-shift

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@joelriou joelriou added the t-category-theory Category theory label Jan 24, 2026
@github-actions github-actions bot added the large-import Automatically added label for PRs with a significant increase in transitive imports label Jan 24, 2026
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github-actions bot commented Jan 24, 2026

PR summary 002831b4f3

Import changes for modified files

No significant changes to the import graph

Import changes for all files
Files Import difference
3 files Mathlib.CategoryTheory.ObjectProperty.Shift Mathlib.CategoryTheory.Triangulated.TStructure.Basic Mathlib.CategoryTheory.Triangulated.TStructure.TruncLTGE
1
Mathlib.CategoryTheory.ObjectProperty.ShiftAdditive (new file) 691

Declarations diff

+ commShiftι
+ hasShift
+ instance [P.IsClosedUnderIsomorphisms] (F : E ⥤ C) [F.CommShift A] :
+ instance {C : Type*} [Category* C] (P : ObjectProperty C)
++ instance [F.CommShift A] :

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).

@github-actions github-actions bot removed the large-import Automatically added label for PRs with a significant increase in transitive imports label Jan 27, 2026
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Thanks 🎉

bors merge

@ghost ghost added the ready-to-merge This PR has been sent to bors. label Jan 29, 2026
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mathlib-bors bot commented Jan 29, 2026

Pull request successfully merged into master.

Build succeeded:

@mathlib-bors mathlib-bors bot changed the title feat(CategoryTheory/Shift): the shift on a full subcategory [Merged by Bors] - feat(CategoryTheory/Shift): the shift on a full subcategory Jan 29, 2026
@mathlib-bors mathlib-bors bot closed this Jan 29, 2026
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2 participants