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Pull requests: leanprover-community/mathlib4
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feat(AlgebraicGeometry): infinitesimal lifting criterion for formally unramified morphisms
t-algebraic-geometry
Algebraic geometry
#35397
opened Feb 16, 2026 by
erdOne
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feat(CategoryTheory/Sites): descent data when we have pullbacks
blocked-by-other-PR
This PR depends on another PR (this label is automatically managed by a bot)
t-category-theory
Category theory
WIP
Work in progress
#35396
opened Feb 16, 2026 by
joelriou
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1 task
chore(CategoryTheory/Subobject): correct Category theory
inf_eq_map_pullback
t-category-theory
#35395
opened Feb 16, 2026 by
FernandoChu
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feat(Tactic/Positivity): make positivity work for types that are not partial orders
new-contributor
This PR was made by a contributor with at most 5 merged PRs. Welcome to the community!
t-meta
Tactics, attributes or user commands
#35394
opened Feb 16, 2026 by
HugLycan
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feat(CategoryTheory/Limits): chosen pullbacks
t-category-theory
Category theory
#35393
opened Feb 16, 2026 by
joelriou
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feat(CategoryTheory/Triangulated): the heart of a t-structure
t-category-theory
Category theory
#35392
opened Feb 16, 2026 by
joelriou
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feat(Geometry/Manifold): API for extended coordinate changes
t-differential-geometry
Manifolds etc
#35391
opened Feb 16, 2026 by
peabrainiac
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ci: Relax cache upload gating to upload cache artifacts from non-success builds
CI
Modifies the continuous integration setup or other automation
#35390
opened Feb 16, 2026 by
marcelolynch
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ci: Update the workflow so the chain doesn’t get skipped when upload_cache is skipped
CI
Modifies the continuous integration setup or other automation
#35389
opened Feb 16, 2026 by
marcelolynch
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feat(CategoryTheory/Triangulated): abelian subcategories
blocked-by-other-PR
This PR depends on another PR (this label is automatically managed by a bot)
t-category-theory
Category theory
WIP
Work in progress
#35387
opened Feb 15, 2026 by
joelriou
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1 task
feat: CategoryTheory.toSheafify induces an isomorphism on stalks
new-contributor
This PR was made by a contributor with at most 5 merged PRs. Welcome to the community!
t-algebraic-geometry
Algebraic geometry
t-category-theory
Category theory
t-topology
Topological spaces, uniform spaces, metric spaces, filters
#35386
opened Feb 15, 2026 by
Brian-Nugent
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chore(ODE/PicardLindelof): strengthen
easy
< 20s of review time. See the lifecycle page for guidelines.
t-analysis
Analysis (normed *, calculus)
#35385
opened Feb 15, 2026 by
hrmacbeth
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feat: inv lemmas for uniform convergence, missing A reviewer has approved the changed; awaiting maintainer approval.
t-topology
Topological spaces, uniform spaces, metric spaces, filters
to_fun attributes
maintainer-merge
#35384
opened Feb 15, 2026 by
sgouezel
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feat(CategoryTheory): constructor for abelian categories
t-category-theory
Category theory
#35381
opened Feb 15, 2026 by
joelriou
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feat(Algebra/Homology/SpectralObject): construction of the objects on the pages of the spectral sequence
blocked-by-other-PR
This PR depends on another PR (this label is automatically managed by a bot)
t-algebra
Algebra (groups, rings, fields, etc)
t-category-theory
Category theory
WIP
Work in progress
#35378
opened Feb 15, 2026 by
joelriou
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3 tasks
feat(Geometry/Manifold): orientable manifolds
blocked-by-other-PR
This PR depends on another PR (this label is automatically managed by a bot)
new-contributor
This PR was made by a contributor with at most 5 merged PRs. Welcome to the community!
t-differential-geometry
Manifolds etc
WIP
Work in progress
#35376
opened Feb 15, 2026 by
michaellee94
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1 task
feat(Algebra/Homology/SpectralObject): first quadrant spectral objects
blocked-by-other-PR
This PR depends on another PR (this label is automatically managed by a bot)
t-category-theory
Category theory
WIP
Work in progress
#35375
opened Feb 15, 2026 by
joelriou
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5 tasks
feat(Algebra/Homology/SpectralObject): This PR depends on another PR (this label is automatically managed by a bot)
t-category-theory
Category theory
WIP
Work in progress
HasSpectralSequence
blocked-by-other-PR
#35374
opened Feb 15, 2026 by
joelriou
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4 tasks
feat(Order/Fin): lemmas about Fin.clamp
t-order
Order theory
#35373
opened Feb 15, 2026 by
joelriou
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feat(Algebra/Homology/SpectralObject): This PR depends on another PR (this label is automatically managed by a bot)
t-algebra
Algebra (groups, rings, fields, etc)
t-category-theory
Category theory
WIP
Work in progress
SpectralSequenceMkData
blocked-by-other-PR
#35372
opened Feb 15, 2026 by
joelriou
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1 task
feat(MulAction): add a SMulDistribClass instance for subgroups
t-algebra
Algebra (groups, rings, fields, etc)
#35371
opened Feb 15, 2026 by
xroblot
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feat(CategoryTheory/Triangulated/TStructure): the spectral object
blocked-by-other-PR
This PR depends on another PR (this label is automatically managed by a bot)
large-import
Automatically added label for PRs with a significant increase in transitive imports
t-category-theory
Category theory
WIP
Work in progress
#35370
opened Feb 15, 2026 by
joelriou
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5 tasks
feat(CategoryTheory/Triangulated/TStructure): properties of truncations indexed by This PR depends on another PR (this label is automatically managed by a bot)
large-import
Automatically added label for PRs with a significant increase in transitive imports
t-category-theory
Category theory
WIP
Work in progress
EInt that use the octahedron axiom
blocked-by-other-PR
#35369
opened Feb 15, 2026 by
joelriou
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4 tasks
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