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
Contributed foundational features to leanprover-community/mathlib4, focusing on formalizing mathematical structures and enhancing combinatorial and graph theory tooling. Developed order isomorphisms for Complete Atomic Boolean Algebras and established equivalence theorems in ordered sets, improving proof reuse and consistency. Introduced a graph compatibility predicate and comprehensive subgraph relations, enabling safer graph transformations and robust subgraph reasoning. Expanded APIs for partitions, circle algebra, and graph/topology operations, supporting advanced mathematical modeling. Leveraged Lean, functional programming, and formal verification to deliver well-documented, reusable code. Addressed both feature development and targeted bug fixes, demonstrating depth in mathematical logic, type theory, and collaborative engineering practices.
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
308 peopleShared Repositories
308
Amelia LivingstonMember
张守信(Shouxin Zhang)Member
Jingting WangMember
themathqueenMember
Kamille BidanMember
Hao ShenMember
Tianyi ZhaoMember
FMLJohnMember
Aaron HillMember
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
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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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