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[Merged by Bors] - feat(CategoryTheory/ComposableArrows): API for the composition of three arrows#33880

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[Merged by Bors] - feat(CategoryTheory/ComposableArrows): API for the composition of three arrows#33880
joelriou wants to merge 5 commits intoleanprover-community:masterfrom
joelriou:spectral-sequences-3-composable-arrows-three

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@joelriou joelriou commented Jan 12, 2026

This shall be used in the formalization of spectral sequences #33842.


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@joelriou joelriou added the t-category-theory Category theory label Jan 12, 2026
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github-actions bot commented Jan 12, 2026

PR summary 2cdef43fea

Import changes for modified files

No significant changes to the import graph

Import changes for all files
Files Import difference
Mathlib.CategoryTheory.ComposableArrows.Three (new file) 448

Declarations diff

+ threeδ₁Toδ₀
+ threeδ₁Toδ₀'
+ threeδ₁Toδ₀_app_one
+ threeδ₁Toδ₀_app_two
+ threeδ₁Toδ₀_app_zero
+ threeδ₂Toδ₁
+ threeδ₂Toδ₁'
+ threeδ₂Toδ₁_app_one
+ threeδ₂Toδ₁_app_two
+ threeδ₂Toδ₁_app_zero
+ threeδ₃Toδ₂
+ threeδ₃Toδ₂'
+ threeδ₃Toδ₂_app_one
+ threeδ₃Toδ₂_app_two
+ threeδ₃Toδ₂_app_zero

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 Jan 12, 2026
@mathlib4-dependent-issues-bot mathlib4-dependent-issues-bot added the blocked-by-other-PR This PR depends on another PR (this label is automatically managed by a bot) label Jan 12, 2026
@joelriou joelriou removed the WIP Work in progress label Jan 17, 2026
@mathlib4-dependent-issues-bot mathlib4-dependent-issues-bot removed the blocked-by-other-PR This PR depends on another PR (this label is automatically managed by a bot) label Jan 17, 2026
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@jcommelin jcommelin left a comment

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Thanks 🎉

bors merge

I wonder whether eventually all of this should be brought together in a simp-proc. But for now, let's merge this.

@ghost ghost added the ready-to-merge This PR has been sent to bors. label Jan 21, 2026
mathlib-bors bot pushed a commit that referenced this pull request Jan 21, 2026
…ee arrows (#33880)

This shall be used in the formalization of spectral sequences #33842.
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mathlib-bors bot commented Jan 21, 2026

Pull request successfully merged into master.

Build succeeded:

@mathlib-bors mathlib-bors bot changed the title feat(CategoryTheory/ComposableArrows): API for the composition of three arrows [Merged by Bors] - feat(CategoryTheory/ComposableArrows): API for the composition of three arrows Jan 21, 2026
@mathlib-bors mathlib-bors bot closed this Jan 21, 2026
goliath-klein pushed a commit to PrParadoxy/mathlib4 that referenced this pull request Jan 24, 2026
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