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Pull requests: leanprover-community/mathlib4
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chore(Order/Fin/Basic): add missing simp lemmas for coercing order embeddings into functions
t-order
Order theory
#43032
opened Aug 21, 2026 by
SnirBroshi
Collaborator
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feat(Order/Bounds/Basic): simp lemmas for Order theory
upperBounds univ, IsLUB univ, Set.Bounded LE.le
t-order
#43031
opened Aug 21, 2026 by
SnirBroshi
Collaborator
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refactor(Mathlib/Data/Set): split up Lattice.lean
file-removed
A Lean module was (re)moved without a `deprecated_module` annotation
tech debt
Tracking cross-cutting technical debt, see e.g. the "Technical debt counters" stream on zulip
#43030
opened Aug 21, 2026 by
loefflerd
Contributor
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chore(RingTheory): tidy markdown headers
t-ring-theory
Ring theory
#43029
opened Aug 21, 2026 by
harahu
Contributor
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feat(Analysis/CStarAlgebra): Analysis (normed *, calculus)
@[congr] lemmas for cfc
t-analysis
#43028
opened Aug 21, 2026 by
j-loreaux
Contributor
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chore: topologicalGroup -> isTopologicalGroup in names
#43027
opened Aug 21, 2026 by
ADedecker
Member
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chore(IsTopologicalBasis): review naming
t-topology
Topological spaces, uniform spaces, metric spaces, filters
#43026
opened Aug 21, 2026 by
ADedecker
Member
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feat(Analysis/CStarAlgebra): grind patterns for cfc junk values
t-analysis
Analysis (normed *, calculus)
#43025
opened Aug 21, 2026 by
j-loreaux
Contributor
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feat: < 20s of review time. See the lifecycle page for guidelines.
t-algebra
Algebra (groups, rings, fields, etc)
isMulCommutative_mono for subobjects
easy
#43024
opened Aug 21, 2026 by
j-loreaux
Contributor
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feat(Order/RelSeries): change Order theory
FiniteDimensional to allow empty types
t-order
#43023
opened Aug 21, 2026 by
SnirBroshi
Collaborator
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refactor(MeasureTheory/Integral): split SetToL1.lean
t-measure-probability
Measure theory / Probability theory
tech debt
Tracking cross-cutting technical debt, see e.g. the "Technical debt counters" stream on zulip
#43021
opened Aug 21, 2026 by
loefflerd
Contributor
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feat(Geometry/Manifold): add induced covariant derivative for Hom-bundles
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
#43020
opened Aug 21, 2026 by
mpacholski
Contributor
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1 task
refactor(Analysis/Normed/Unbundled/SpectralNorm): extract, generalize, and golf Analysis (normed *, calculus)
algNormFromConst
t-analysis
#43019
opened Aug 21, 2026 by
tb65536
Contributor
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1 task done
feat(Combinatorics): define network flows
t-combinatorics
Combinatorics
WIP
Work in progress
#43017
opened Aug 21, 2026 by
felixpernegger
Contributor
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feat(Analysis/Matrix/Normed): norm of block diagonal matrix
t-analysis
Analysis (normed *, calculus)
#43016
opened Aug 21, 2026 by
tb65536
Contributor
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refactor(Analysis/Normed/Unbundled/SpectralNorm): extract, generalize, and golf uniqueness of power-multiplicative norms
t-analysis
Analysis (normed *, calculus)
#43015
opened Aug 21, 2026 by
tb65536
Contributor
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refactor(CategoryTheory/Sites): split long file Sieves.lean
t-category-theory
Category theory
tech debt
Tracking cross-cutting technical debt, see e.g. the "Technical debt counters" stream on zulip
#43014
opened Aug 21, 2026 by
loefflerd
Contributor
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feat: diffeomorphisms are smooth embeddings
t-differential-geometry
Manifolds etc
#43013
opened Aug 21, 2026 by
grunweg
Contributor
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chore(RingTheory/Valuation): remove all Tracking cross-cutting technical debt, see e.g. the "Technical debt counters" stream on zulip
set_options in RingTheory/Valuation
tech debt
#43011
opened Aug 21, 2026 by
Whysoserioushah
Collaborator
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refactor(Topology/Algebra/Group): split long file Basic.lean
t-topology
Topological spaces, uniform spaces, metric spaces, filters
tech debt
Tracking cross-cutting technical debt, see e.g. the "Technical debt counters" stream on zulip
#43010
opened Aug 21, 2026 by
loefflerd
Contributor
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refactor(CategoryTheory): use quadrifunctors for the localized pentagon
blocked-by-other-PR
This PR depends on another PR (this label is automatically managed by a bot)
LLM-generated
PRs with substantial input from LLMs - review accordingly
t-category-theory
Category theory
tech debt
Tracking cross-cutting technical debt, see e.g. the "Technical debt counters" stream on zulip
WIP
Work in progress
#43009
opened Aug 21, 2026 by
dagurtomas
Contributor
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2 tasks
feat(CategoryTheory): express monoidal pentagons using quadrifunctors
blocked-by-other-PR
This PR depends on another PR (this label is automatically managed by a bot)
LLM-generated
PRs with substantial input from LLMs - review accordingly
t-category-theory
Category theory
WIP
Work in progress
#43008
opened Aug 21, 2026 by
dagurtomas
Contributor
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1 task
feat(CategoryTheory): localize quadrifunctors
blocked-by-other-PR
This PR depends on another PR (this label is automatically managed by a bot)
LLM-generated
PRs with substantial input from LLMs - review accordingly
t-category-theory
Category theory
WIP
Work in progress
#43007
opened Aug 21, 2026 by
dagurtomas
Contributor
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1 task
feat(CategoryTheory): add functor API for quadrifunctors
LLM-generated
PRs with substantial input from LLMs - review accordingly
t-category-theory
Category theory
WIP
Work in progress
#43006
opened Aug 21, 2026 by
dagurtomas
Contributor
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chore(Logic/Equiv): swap the names of Data (lists, quotients, numbers, etc)
Equiv.setCongr and Equiv.Set.congr
t-data
#43005
opened Aug 21, 2026 by
YaelDillies
Contributor
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Updated in the last three days: updated:>2026-08-18.