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, this developer enhanced the CohenMacaulay repository by delivering two foundational features in Lean, focusing on abstract algebra and formal verification. They introduced an Ext Scalar Multiplication API, enabling noncomputable scalar actions on Ext objects and supporting left multiplication and annihilator-based zero maps. Additionally, they refactored SMulRegular to use span-based submodules for quotient constructions, tightening exactness proofs and updating universe declarations for improved maintainability. Their work strengthened the algebraic primitives and proof infrastructure, reducing future extension risks and supporting downstream development. The depth of these changes advanced both the technical maturity and extensibility of the codebase.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
3Total
Bugs
0
Commits
3
Features
2
Lines of code
56
Activity Months1
Your Network
31 peopleSame Organization
@stu.pku.edu.cn25
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
Repositories Contributed To
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