leanprover-community/mathlib4
Feb 2026 – Mar 2026
2 Months active
Languages Used
Lean
Technical Skills
formal verificationmathematicstheorem proving
Hang Lu Su
PROFILE
Hang Lu Su
Hanglu Su contributed foundational group theory features to the leanprover-community/mathlib4 repository, focusing on formal verification and theorem proving using Lean. Over two months, Hanglu formalized the result that the normal closure of an empty set is the trivial subgroup, providing a key lemma for the group theory framework and supporting future work on finitely presented groups. Additionally, Hanglu introduced a theorem in FreeGroup theory showing that a surjection between types induces a surjection on free groups, improving the reliability of type-to-free-group transformations. The work demonstrated depth in mathematical formalization and careful integration with ongoing formalization efforts.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
2Total
Bugs
0
Commits
2
Features
2
Lines of code
22
Activity Months2
Your Network
301 peopleShared Repositories
301
Work History
March 2026
1 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for leanprover-community/mathlib4. Key achievement: introduced a theorem in FreeGroup theory establishing that a surjection between arbitrary types α → β induces a surjection on the corresponding FreeGroup.map. Implemented in GroupTheory/FreeGroup/Basic; commit 4250d1a5385863f765570ea47b0ee236d3a3ec3e, and linked to the broader effort in PR #34236 for formalizing finitely presented groups.
1 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for leanprover-community/mathlib4. Key achievement: introduced a theorem in FreeGroup theory establishing that a surjection between arbitrary types α → β induces a surjection on the corresponding FreeGroup.map. Implemented in GroupTheory/FreeGroup/Basic; commit 4250d1a5385863f765570ea47b0ee236d3a3ec3e, and linked to the broader effort in PR #34236 for formalizing finitely presented groups.
March 2026
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026 (2026-02) monthly summary for leanprover-community/mathlib4: Key feature delivered: the normal closure of an empty set is the trivial subgroup, establishing a foundational lemma for the group theory framework and supporting future work on finitely presented groups. This work is linked to the larger formalization effort (PRs #34236) and depends on the new lemma introduced in commit 2f9c4948263929ba83087abfa6678485914381e8 (#35029).
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026 (2026-02) monthly summary for leanprover-community/mathlib4: Key feature delivered: the normal closure of an empty set is the trivial subgroup, establishing a foundational lemma for the group theory framework and supporting future work on finitely presented groups. This work is linked to the larger formalization effort (PRs #34236) and depends on the new lemma introduced in commit 2f9c4948263929ba83087abfa6678485914381e8 (#35029).
Activity
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Quality Metrics
Correctness100.0%
Maintainability100.0%
Architecture100.0%
Performance100.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
Lean
Technical Skills
formal verificationmathematicstheorem proving
Repositories Contributed To
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