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Pull requests: leanprover-community/mathlib4
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chore(FieldTheory/AbelRuffini): simpler definition of Algebra (groups, rings, fields, etc)
solvableByRad
t-algebra
#35908
opened Mar 1, 2026 by
vihdzp
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fix(Topology/Defs/Basic): preserve noncanonical topology instances in delaboration
new-contributor
This PR was made by a contributor with at most 5 merged PRs. Welcome to the community!
t-topology
Topological spaces, uniform spaces, metric spaces, filters
#35907
opened Mar 1, 2026 by
JJYYY-JJY
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feat(Combinatorics/SimpleGraph/Walks): add Walk.IsChord and Walk.IsChordless
new-contributor
This PR was made by a contributor with at most 5 merged PRs. Welcome to the community!
t-combinatorics
Combinatorics
feat(Combinatorics/Graph): Add definitions for small graphs (noEdge, bouquet, banana)
t-combinatorics
Combinatorics
#35905
opened Mar 1, 2026 by
Jun2M
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feat(CategoryTheory/Sites): the maximal This PR depends on another PR (this label is automatically managed by a bot)
t-category-theory
Category theory
1-hypercover containing a 0-hypercover
blocked-by-other-PR
#35904
opened Mar 1, 2026 by
chrisflav
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1 task
chore: make CompleteLattice helpers instance reducible
new-contributor
This PR was made by a contributor with at most 5 merged PRs. Welcome to the community!
t-order
Order theory
#35903
opened Mar 1, 2026 by
matthewjasper
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feat(CategoryTheory/Sites): homotopy equivalent hypercovers have equivalent sheaf conditions
t-category-theory
Category theory
#35902
opened Feb 28, 2026 by
chrisflav
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feat(CategoryTheory/Sites): isomorphic hypercovers have equivalent sheaf conditions
t-category-theory
Category theory
#35901
opened Feb 28, 2026 by
chrisflav
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chore: Fix non-defeq diamonds on OrderDual
new-contributor
This PR was made by a contributor with at most 5 merged PRs. Welcome to the community!
#35900
opened Feb 28, 2026 by
matthewjasper
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feat(Analysis): Analysis (normed *, calculus)
extremePoints 𝕜 (closedBall 0 1) ⊆ sphere 0 1
t-analysis
#35899
opened Feb 28, 2026 by
themathqueen
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feat(Algebra/Star/StarProjection): add < 20s of review time. See the lifecycle page for guidelines.
t-algebra
Algebra (groups, rings, fields, etc)
IsStarProjection.map
easy
#35898
opened Feb 28, 2026 by
themathqueen
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feat(Algebra/Ring/Subring): the equivalence between two equal subrings
maintainer-merge
A reviewer has approved the changed; awaiting maintainer approval.
t-algebra
Algebra (groups, rings, fields, etc)
#35897
opened Feb 28, 2026 by
joelriou
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feat(CategoryTheory/Topos/Classifier): subobject classifiers, isos and equivalences
t-category-theory
Category theory
#35895
opened Feb 28, 2026 by
edegeltje
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feat(Data/Nat/Choose/Lucas): add choose_mul_mul and choose_pow_mul_pow_mul modular congruence lemmas
t-data
Data (lists, quotients, numbers, etc)
#35893
opened Feb 28, 2026 by
b-mehta
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feat(Data): lemmas for Data (lists, quotients, numbers, etc)
List.bagInter
t-data
#35892
opened Feb 28, 2026 by
vlad902
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chore: move differential geometry elaborators tests into a separate d…
easy
< 20s of review time. See the lifecycle page for guidelines.
file-removed
A Lean module was (re)moved without a `deprecated_module` annotation
#35891
opened Feb 28, 2026 by
grunweg
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chore: delete deprecated module Topology/PartialHomeomorph
easy
< 20s of review time. See the lifecycle page for guidelines.
t-topology
Topological spaces, uniform spaces, metric spaces, filters
#35890
opened Feb 28, 2026 by
grunweg
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chore(LinearAlgebra): reduce defeq abuse of Algebra (groups, rings, fields, etc)
Set α = α → Prop
t-algebra
#35888
opened Feb 28, 2026 by
urkud
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chore: exhaustively replace
measurability/continuity → fun_prop, simp_all → simp where possible
#35886
opened Feb 28, 2026 by
euprunin
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chore: fix induction and recursor names
tech debt
Tracking cross-cutting technical debt, see e.g. the "Technical debt counters" stream on zulip
#35884
opened Feb 28, 2026 by
Parcly-Taxel
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chore(RingTheory/Adjoin/Polynomial): move to This pull request has been delegated to the PR author (or occasionally another non-maintainer).
file-removed
A Lean module was (re)moved without a `deprecated_module` annotation
t-algebra
Algebra (groups, rings, fields, etc)
Basic.lean
delegated
#35883
opened Feb 28, 2026 by
xgenereux
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feat(Algebra/ModuleCat): API on short complex in ModuleCat
t-algebra
Algebra (groups, rings, fields, etc)
#35882
opened Feb 28, 2026 by
Thmoas-Guan
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