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[Merged by Bors] - feat(CategoryTheory/Adjunction): more mate compatibilities#30335

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joelriou:adjunction-composition-iso
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[Merged by Bors] - feat(CategoryTheory/Adjunction): more mate compatibilities#30335
joelriou wants to merge 9 commits intoleanprover-community:masterfrom
joelriou:adjunction-composition-iso

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@joelriou joelriou commented Oct 8, 2025 •
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We obtain various lemmas about adjunctions between functors by computing conjugateEquiv in case of associators, unitors, and whiskerings. We deduce a way to obtain compatibilites with respect to composition of functors of left adjoints assuming that we have these compatibilites for right adjoints. In #30318, this shall be applied to the study of the compatibilities with respect to composition of the pullback functors for presheaves of modules.

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@joelriou joelriou added the t-category-theory Category theory label Oct 8, 2025
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github-actions bot commented Oct 8, 2025 •
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PR summary 942e9770c4

Import changes for modified files

No significant changes to the import graph

Import changes for all files
Files Import difference
Mathlib.CategoryTheory.Adjunction.CompositionIso (new file) 411

Declarations diff

+ conjugateEquiv_associator_hom
+ conjugateEquiv_leftUnitor_hom
+ conjugateEquiv_rightUnitor_hom
+ conjugateEquiv_whiskerLeft
+ conjugateEquiv_whiskerRight
+ leftAdjointCompIso
+ leftAdjointCompIso_assoc
+ leftAdjointCompIso_comp_id
+ leftAdjointCompIso_hom
+ leftAdjointCompIso_id_comp
+ leftAdjointCompNatTrans
+ leftAdjointCompNatTrans_assoc
+ leftAdjointCompNatTrans₀₁₃_eq_conjugateEquiv_symm
+ leftAdjointCompNatTrans₀₂₃_eq_conjugateEquiv_symm
+ leftAdjointIdIso

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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kim-em commented Oct 28, 2025

Happy for you to disagree with my queries about @[simp].

bors d+

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mathlib-bors bot commented Oct 28, 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.

@ghost ghost added the delegated This pull request has been delegated to the PR author (or occasionally another non-maintainer). label Oct 28, 2025
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joelriou commented Oct 29, 2025

Thanks!

bors merge

@ghost ghost added the ready-to-merge This PR has been sent to bors. label Oct 29, 2025
mathlib-bors bot pushed a commit that referenced this pull request Oct 29, 2025
@joelriou
feat(CategoryTheory/Adjunction): more mate compatibilities (#30335)
150a1e4 
We obtain various lemmas about adjunctions between functors by computing `conjugateEquiv` in case of associators, unitors, and whiskerings. We deduce a way to obtain compatibilites with respect to composition of functors of left adjoints assuming that we have these compatibilites for right adjoints. In #30318, this shall be applied to the study of the compatibilities with respect to composition of the pullback functors for presheaves of modules.
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mathlib-bors bot commented Oct 29, 2025

Pull request successfully merged into master.

Build succeeded:

@mathlib-bors mathlib-bors bot changed the title feat(CategoryTheory/Adjunction): more mate compatibilities [Merged by Bors] - feat(CategoryTheory/Adjunction): more mate compatibilities Oct 29, 2025
@mathlib-bors mathlib-bors bot closed this Oct 29, 2025
BeibeiX0 pushed a commit to BeibeiX0/mathlib4 that referenced this pull request Nov 7, 2025
@joelriou @BeibeiX0
feat(CategoryTheory/Adjunction): more mate compatibilities (leanprove…
f27124b 
…r-community#30335)

We obtain various lemmas about adjunctions between functors by computing `conjugateEquiv` in case of associators, unitors, and whiskerings. We deduce a way to obtain compatibilites with respect to composition of functors of left adjoints assuming that we have these compatibilites for right adjoints. In leanprover-community#30318, this shall be applied to the study of the compatibilities with respect to composition of the pullback functors for presheaves of modules.
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