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[Merged by Bors] - feat(CategoryTheory/Limits): pro-coyoneda lemma#12841

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[Merged by Bors] - feat(CategoryTheory/Limits): pro-coyoneda lemma#12841
chrisflav wants to merge 3 commits intomasterfrom
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@chrisflav chrisflav commented May 12, 2024

Shows a pro-coyoneda lemma. More precisely:

If D : Iᵒᵖ ⥤ C is a diagram and F : C ⥤ Type type-valued functor, then homomorphisms from colimit (D.rightOp ⋙ coyoneda) ⟶ F are isomorphic to limit (D ⋙ F ⋙ uliftFunctor).

Also shows a variant of this for a covariant diagram D.

To establish the pro-coyoneda lemma, some cocontinuity isomorphisms for Hom are spelled out.


This is needed for #12843.

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@chrisflav chrisflav added the t-category-theory Category theory label May 12, 2024
@chrisflav chrisflav added awaiting-review awaiting-CI This PR does not pass CI yet. This label is automatically removed once it does. labels May 12, 2024
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@chrisflav chrisflav requested a review from adamtopaz May 18, 2024 08:23
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Thanks, and sorry for the delay!

bors r+

@github-actions github-actions bot added ready-to-merge This PR has been sent to bors. and removed awaiting-review labels May 23, 2024
mathlib-bors bot pushed a commit that referenced this pull request May 23, 2024
Shows a pro-coyoneda lemma. More precisely:

If `D : Iᵒᵖ ⥤ C` is a diagram and `F : C ⥤ Type` type-valued functor, then homomorphisms from `colimit (D.rightOp ⋙ coyoneda) ⟶ F` are isomorphic to `limit (D ⋙ F ⋙ uliftFunctor)`.

Also shows a variant of this for a covariant diagram `D`.

To establish the pro-coyoneda lemma, some cocontinuity isomorphisms for `Hom` are spelled out.
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mathlib-bors bot commented May 23, 2024

Pull request successfully merged into master.

Build succeeded:

@mathlib-bors mathlib-bors bot changed the title feat(CategoryTheory/Limits): pro-coyoneda lemma [Merged by Bors] - feat(CategoryTheory/Limits): pro-coyoneda lemma May 23, 2024
@mathlib-bors mathlib-bors bot closed this May 23, 2024
@mathlib-bors mathlib-bors bot deleted the chrisflav/galois-prorep.4 branch May 23, 2024 21:38
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Thanks for the review!

grunweg pushed a commit that referenced this pull request May 24, 2024
Shows a pro-coyoneda lemma. More precisely:

If `D : Iᵒᵖ ⥤ C` is a diagram and `F : C ⥤ Type` type-valued functor, then homomorphisms from `colimit (D.rightOp ⋙ coyoneda) ⟶ F` are isomorphic to `limit (D ⋙ F ⋙ uliftFunctor)`.

Also shows a variant of this for a covariant diagram `D`.

To establish the pro-coyoneda lemma, some cocontinuity isomorphisms for `Hom` are spelled out.
callesonne pushed a commit that referenced this pull request Jun 4, 2024
Shows a pro-coyoneda lemma. More precisely:

If `D : Iᵒᵖ ⥤ C` is a diagram and `F : C ⥤ Type` type-valued functor, then homomorphisms from `colimit (D.rightOp ⋙ coyoneda) ⟶ F` are isomorphic to `limit (D ⋙ F ⋙ uliftFunctor)`.

Also shows a variant of this for a covariant diagram `D`.

To establish the pro-coyoneda lemma, some cocontinuity isomorphisms for `Hom` are spelled out.
js2357 pushed a commit that referenced this pull request Jun 18, 2024
Shows a pro-coyoneda lemma. More precisely:

If `D : Iᵒᵖ ⥤ C` is a diagram and `F : C ⥤ Type` type-valued functor, then homomorphisms from `colimit (D.rightOp ⋙ coyoneda) ⟶ F` are isomorphic to `limit (D ⋙ F ⋙ uliftFunctor)`.

Also shows a variant of this for a covariant diagram `D`.

To establish the pro-coyoneda lemma, some cocontinuity isomorphisms for `Hom` are spelled out.
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