leanprover-community/mathlib4
Nov 2025 – Apr 2026
5 Months active
Languages Used
Lean
Technical Skills
formal verificationmathematical logictheorem provingfunctional programminggraph theorytype theory
Jun Kwon
PROFILE
Jun Kwon
Over five months, [Name] contributed foundational features to leanprover-community/mathlib4, focusing on formal verification and combinatorial mathematics using Lean. They developed order isomorphisms for Complete Atomic Boolean Algebras, expanded equivalence theorems in ordered sets, and introduced a compatibility predicate for graph incidence relations, enabling safer graph transformations. Their work included new APIs for subgraph relations, partition lattices, and representative functions, as well as algebraic extensions for circle-valued computations. By addressing both theoretical depth and practical API design, [Name] improved proof automation, mathematical modeling, and code maintainability, demonstrating strong skills in Lean programming, type theory, and mathematical logic.
Overall Statistics
Feature vs Bugs
90%Features
Repository Contributions
18Total
Bugs
1
Commits
18
Features
9
Lines of code
1,995
Activity Months5
Your Network
301 peopleShared Repositories
301
Work History
April 2026
12 Commits • 4 Features
Apr 1, 2026April 2026 focused on expanding foundational APIs and robustness across partition representations, algebra of circle-valued computations, graph/topology tooling, and logical symmetry. Key outcomes include enabling consistent representative-function usage in partitioned structures, expanded algebraic handling for circle-valued data, and richer graph/topology tooling, alongside a targeted bug fix that increases modeling flexibility in locally path-connected spaces.
12 Commits • 4 Features
Apr 1, 2026April 2026 focused on expanding foundational APIs and robustness across partition representations, algebra of circle-valued computations, graph/topology tooling, and logical symmetry. Key outcomes include enabling consistent representative-function usage in partitioned structures, expanded algebraic handling for circle-valued data, and richer graph/topology tooling, alongside a targeted bug fix that increases modeling flexibility in locally path-connected spaces.
April 2026
March 2026
3 Commits • 2 Features
Mar 1, 2026March 2026 summary focused on expanding combinatorial modeling capabilities and lattice API in leanprover-community/mathlib4. Delivered two major feature streams across Graph theory and Partition lattices, with contributions that enhance expressiveness, API usability, and proof automation. No major defects reported; minor API consistency improvements prepared the ground for broader adoption.
March 2026
3 Commits • 2 Features
Mar 1, 2026March 2026 summary focused on expanding combinatorial modeling capabilities and lattice API in leanprover-community/mathlib4. Delivered two major feature streams across Graph theory and Partition lattices, with contributions that enhance expressiveness, API usability, and proof automation. No major defects reported; minor API consistency improvements prepared the ground for broader adoption.
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for leanprover-community/mathlib4. The major deliverable was the introduction of a Graph Compatibility Predicate (Compatible) to systematically compare incidence relations between graphs, enabling safe graph transformations and subgraph reasoning. API surface includes compatibility checks, reflexivity and symmetry properties, IsLink.of_compatible, Compatible.of_disjoint_edgeSet, and variants for Inc/IsLoopAt/IsNonloopAt, plus a copy API to duplicate graphs with new vertex/edge sets while preserving IsLink semantics. This work is encapsulated in the commit e527740eb2515844103df863a9af9f1301ad3a9c, stemming from the feature PR "feat(Combinatorics/Graph): add Compatible definition and API" (#34783) and supports ongoing subgraph work (#26770).
1 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for leanprover-community/mathlib4. The major deliverable was the introduction of a Graph Compatibility Predicate (Compatible) to systematically compare incidence relations between graphs, enabling safe graph transformations and subgraph reasoning. API surface includes compatibility checks, reflexivity and symmetry properties, IsLink.of_compatible, Compatible.of_disjoint_edgeSet, and variants for Inc/IsLoopAt/IsNonloopAt, plus a copy API to duplicate graphs with new vertex/edge sets while preserving IsLink semantics. This work is encapsulated in the commit e527740eb2515844103df863a9af9f1301ad3a9c, stemming from the feature PR "feat(Combinatorics/Graph): add Compatible definition and API" (#34783) and supports ongoing subgraph work (#26770).
February 2026
January 2026
1 Commits • 1 Features
Jan 1, 2026January 2026 monthly summary for leanprover-community/mathlib4. Key theoretical enhancements were delivered in the Ordered Sets module, establishing critical equivalences that strengthen the mathematical framework and proof reuse. No major bugs fixed this month; efforts focused on expanding foundational theory, improving consistency, and documenting design decisions. Overall impact includes a clearer pathway for proofs involving Minimal, IsLeast, Maximal, and IsGreatest under DirectedOn and total order conditions, enabling downstream contributions and library reliability. Technologies/skills demonstrated include Lean theorem proving, formalization of order theory, and careful commit-driven development with attention to code quality and documentation.
January 2026
1 Commits • 1 Features
Jan 1, 2026January 2026 monthly summary for leanprover-community/mathlib4. Key theoretical enhancements were delivered in the Ordered Sets module, establishing critical equivalences that strengthen the mathematical framework and proof reuse. No major bugs fixed this month; efforts focused on expanding foundational theory, improving consistency, and documenting design decisions. Overall impact includes a clearer pathway for proofs involving Minimal, IsLeast, Maximal, and IsGreatest under DirectedOn and total order conditions, enabling downstream contributions and library reliability. Technologies/skills demonstrated include Lean theorem proving, formalization of order theory, and careful commit-driven development with attention to code quality and documentation.
November 2025
1 Commits • 1 Features
Nov 1, 2025Month 2025-11: Delivered a key formalization in leanprover-community/mathlib4 around Complete Atomic Boolean Algebras. Implemented an order isomorphism between a CompleteAtomicBooleanAlgebra and the set of its atoms, strengthening the atomic decomposition framework and enabling downstream proofs.
1 Commits • 1 Features
Nov 1, 2025Month 2025-11: Delivered a key formalization in leanprover-community/mathlib4 around Complete Atomic Boolean Algebras. Implemented an order isomorphism between a CompleteAtomicBooleanAlgebra and the set of its atoms, strengthening the atomic decomposition framework and enabling downstream proofs.
November 2025
Activity
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Quality Metrics
Correctness100.0%
Maintainability96.8%
Architecture100.0%
Performance96.8%
AI Usage21.2%
Skills & Technologies
Programming Languages
Lean
Technical Skills
LeanLean programmingcombinatorial mathematicsformal verificationfunctional programminggraph theorymathematical analysismathematical logicmathematical proofsmathematicstheorem provingtheorytopologytype theory
Repositories Contributed To
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