xyzw12345/CohenMacaulay
Apr 2025 – Apr 2025
1 Month active
Languages Used
Lean
Technical Skills
Abstract AlgebraCategory TheoryFormal VerificationHomological Algebra
Blackfeather007
PROFILE
Blackfeather007
During April 2025, Yifan Wang enhanced the CohenMacaulay repository by developing two foundational features in Lean, leveraging expertise in abstract algebra and formal verification. Wang introduced a noncomputable Ext scalar multiplication API, enabling left scalar actions and handling annihilator-induced zero maps, which strengthens the algebraic expressiveness of Ext objects. Additionally, Wang refactored the SMulRegular module to use span-based submodules for quotient constructions, improving proof exactness and updating universe declarations for consistency. These changes modernized the codebase, improved maintainability, and established a robust infrastructure for future extensions, reflecting a deep understanding of category theory and homological algebra.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
3Total
Bugs
0
Commits
3
Features
2
Lines of code
56
Activity Months1
Your Network
25 people
Work History
April 2025
3 Commits • 2 Features
Apr 1, 2025April 2025 performance focused on strengthening the algebraic foundation in CohenMacaulay, delivering two major capabilities and improving proof robustness. The Ext Scalar Multiplication API introduces a noncomputable Ext scalar action, with Ext.smulLeft and Ext.smulLeft_zero_of_ann to support left multiplication and annihilator-based zero maps. The SMulRegular refactor modernizes quotient constructions using span-based submodules, tightens exactness proofs with clearer submodule membership lemmas, updates universe declarations, and imports SMulRegular into lemma213.lean, including a placeholder for a covariant sequence related to IsSMulRegular. These changes improve expressiveness, maintainability, and readiness for future feature work, delivering concrete business value through more reliable formalizations and easier extension paths.
3 Commits • 2 Features
Apr 1, 2025April 2025 performance focused on strengthening the algebraic foundation in CohenMacaulay, delivering two major capabilities and improving proof robustness. The Ext Scalar Multiplication API introduces a noncomputable Ext scalar action, with Ext.smulLeft and Ext.smulLeft_zero_of_ann to support left multiplication and annihilator-based zero maps. The SMulRegular refactor modernizes quotient constructions using span-based submodules, tightens exactness proofs with clearer submodule membership lemmas, updates universe declarations, and imports SMulRegular into lemma213.lean, including a placeholder for a covariant sequence related to IsSMulRegular. These changes improve expressiveness, maintainability, and readiness for future feature work, delivering concrete business value through more reliable formalizations and easier extension paths.
April 2025
Activity
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Quality Metrics
Correctness73.4%
Maintainability73.4%
Architecture73.4%
Performance60.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
Lean
Technical Skills
Abstract AlgebraCategory TheoryFormal VerificationHomological Algebra
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