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[Merged by Bors] - feat(AlgebraicTopology/SimplicialSet/Subcomplex): add Subcomplex.unionProd, a union of products of subcomplexes#37182

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[Merged by Bors] - feat(AlgebraicTopology/SimplicialSet/Subcomplex): add Subcomplex.unionProd, a union of products of subcomplexes#37182
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@mckoen mckoen commented Mar 25, 2026

Given X Y : SSet, S : X.Subcomplex, and T : Y.Subcomplex, define the subcomplex S.unionProd T : (X ⊗ Y).Subcomplex given by (X ⊗ T) ⊔ (S ⊗ Y) and provide basic API.

All code is originally written by Joël Riou and modified for PR to mathlib (with permission).


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@mckoen mckoen added awaiting-CI This PR does not pass CI yet. This label is automatically removed once it does. t-category-theory Category theory labels Mar 25, 2026
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github-actions Bot commented Mar 25, 2026

PR summary 15edd7a465

Import changes for modified files

Dependency changes

File Base Count Head Count Change
Mathlib.AlgebraicTopology.SimplicialSet.Monoidal 952 964 +12 (+1.26%)
Import changes for all files
Files Import difference
Mathlib.AlgebraicTopology.SimplicialSet.Presentable 7
Mathlib.AlgebraicTopology.Quasicategory.StrictBicategory 9
Mathlib.AlgebraicTopology.SimplicialSet.NerveAdjunction Mathlib.CategoryTheory.Category.Cat.Colimit 10
10 files Mathlib.AlgebraicTopology.SimplicialCategory.Basic Mathlib.AlgebraicTopology.SimplicialCategory.SimplicialObject Mathlib.AlgebraicTopology.SimplicialNerve Mathlib.AlgebraicTopology.SimplicialSet.FiniteProd Mathlib.AlgebraicTopology.SimplicialSet.HoFunctorMonoidal Mathlib.AlgebraicTopology.SimplicialSet.HomotopyCat Mathlib.AlgebraicTopology.SimplicialSet.KanComplex.MulStruct Mathlib.AlgebraicTopology.SimplicialSet.Monoidal Mathlib.AlgebraicTopology.SimplicialSet.ProdStdSimplex Mathlib.AlgebraicTopology.SimplicialSet.RelativeMorphism
12

Declarations diff

+ bicartSq
+ image_β_hom
+ image_β_inv
+ isPushout
+ mem_unionProd_iff
+ preimage_image_of_isIso
+ preimage_β_hom
+ preimage_β_inv
+ prodIso
+ prod_le_prod_top
+ prod_le_top_prod
+ prod_le_unionProd
+ prod_top_le_unionProd
+ symmIso
+ top_prod_le_unionProd
+ unionProd
+ ι₁
+ ι₁_ι
+ ι₂
+ ι₂_ι

You can run this locally as follows
## summary with just the declaration names:
./scripts/pr_summary/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/pr_summary/declarations_diff.sh long <optional_commit>

The doc-module for scripts/pr_summary/declarations_diff.sh contains some details about this script.


No changes to technical debt.

You can run this locally as

./scripts/reporting/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 added t-algebraic-topology Algebraic topology and removed awaiting-CI This PR does not pass CI yet. This label is automatically removed once it does. labels Mar 25, 2026
@joelriou joelriou removed their assignment Mar 26, 2026
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Thanks!

maintainer delegate

Comment thread Mathlib/AlgebraicTopology/SimplicialSet/Monoidal.lean Outdated
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🚀 Pull request has been placed on the maintainer queue by dagurtomas.


pull_request_review, wf_run

@mathlib-triage mathlib-triage Bot added the maintainer-merge A reviewer has approved the changed; awaiting maintainer approval. label Mar 26, 2026
mckoen and others added 2 commits March 26, 2026 15:14
Co-authored-by: Dagur Asgeirsson <dagurtomas@gmail.com>
Add isomorphism for product of simplicial sets.
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Thanks!

bors merge

@mathlib-triage mathlib-triage Bot added ready-to-merge This PR has been sent to bors. and removed maintainer-merge A reviewer has approved the changed; awaiting maintainer approval. labels Mar 27, 2026
mathlib-bors Bot pushed a commit that referenced this pull request Mar 27, 2026
…onProd`, a union of products of subcomplexes (#37182)

Given `X Y : SSet`, `S : X.Subcomplex`, and `T : Y.Subcomplex`, define the subcomplex `S.unionProd T : (X ⊗ Y).Subcomplex` given by `(X ⊗ T) ⊔ (S ⊗ Y)` and provide basic API.

All code is originally written by Joël Riou and modified for PR to mathlib (with permission).
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mathlib-bors Bot commented Mar 27, 2026

Pull request successfully merged into master.

Build succeeded:

@mathlib-bors mathlib-bors Bot changed the title feat(AlgebraicTopology/SimplicialSet/Subcomplex): add Subcomplex.unionProd, a union of products of subcomplexes [Merged by Bors] - feat(AlgebraicTopology/SimplicialSet/Subcomplex): add Subcomplex.unionProd, a union of products of subcomplexes Mar 27, 2026
@mathlib-bors mathlib-bors Bot closed this Mar 27, 2026
justus-springer pushed a commit to justus-springer/mathlib4 that referenced this pull request Mar 28, 2026
…onProd`, a union of products of subcomplexes (leanprover-community#37182)

Given `X Y : SSet`, `S : X.Subcomplex`, and `T : Y.Subcomplex`, define the subcomplex `S.unionProd T : (X ⊗ Y).Subcomplex` given by `(X ⊗ T) ⊔ (S ⊗ Y)` and provide basic API.

All code is originally written by Joël Riou and modified for PR to mathlib (with permission).
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5 participants