HEPLean/PhysLean
Nov 2024 – Aug 2025
3 Months active
Languages Used
Lean
Technical Skills
Abstract AlgebraFormal VerificationMathematical ProofMathematical ProofsType TheoryCode Organization
David Feng
PROFILE
David Feng
Worked on the HEPLean/PhysLean repository to modernize and extend its mathematical foundations for physics applications using Lean and type theory. Delivered a structural redesign of the Space type, improving type safety and extensibility, and enhanced vector-space operations by implementing VAdd instances and full linear algebra support. Refactored and consolidated SpaceStruct definitions into a dedicated module, updated documentation, and addressed code quality through linting and import hygiene. Standardized matrix literal notation in CliffordAlgebra for improved readability and maintainability. Focused on formal verification, mathematical proofs, and code organization, these changes strengthened correctness and laid groundwork for future extensibility and safer integrations.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
9Total
Bugs
0
Commits
9
Features
4
Lines of code
288
Activity Months3
Work History
August 2025
6 Commits • 2 Features
Aug 1, 2025Monthly performance summary for 2025-08 – HEPLean/PhysLean Key features delivered - Space d vector-space enhancements: added VAdd instance for EuclideanSpace/Space d and full vector-space operations (addition, negation, subtraction, scalar multiplication, zero) to enable robust linear-algebra support for physics representations. - SpaceStruct modernization and refactor: extracted core SpaceStruct into dedicated SpaceStruct.lean, consolidated definitions, updated imports, and added documentation; groundwork laid for deprecating the Space abbrev and improving code organization. Major fixes, quality improvements, and maintenance - Code quality: addressed linting issues and import fixes; added missing docstrings to improve readability and maintainability. Impact and business value - Technical impact: enhanced math expressiveness and correctness of vector-space computations; clearer module boundaries and documentation reduce technical debt and accelerate future feature work. - Business value: enables more accurate physics modeling, smoother onboarding for new engineers, and a scalable foundation for upcoming features. Technologies and skills demonstrated - Lean language features: type classes and instances (VAdd), module refactoring, and docstring practices. - Code quality and architecture: linter remediation, import hygiene, and documentation; architectural modernization with dedicated SpaceStruct.lean and deprecation planning. Top achievements - Implemented vector-space operations for Space d with a VAdd instance and full vector-space capabilities (commits 74b45f75ebb0be02f7a88457a30e2d6450453b14; 99a19db076c38d626118fb96365970999c866d3f). - Modernized SpaceStruct: moved to a dedicated SpaceStruct.lean, consolidated definitions, updated imports, and added documentation (commits de630be7b88ea07bd285ac8162686be223650362; ceb962f999b4ff65afb2e5d718f2eeef476decb5; 3794a1915b653c4c75543d3ee72680d282f84a75; 1e49547b205f926da133e856b1525a281e268973). - Quality improvements: lint cleanup, missing docstrings, and import fixes to improve long-term maintainability and ease future contributions (related commits listed above).
6 Commits • 2 Features
Aug 1, 2025Monthly performance summary for 2025-08 – HEPLean/PhysLean Key features delivered - Space d vector-space enhancements: added VAdd instance for EuclideanSpace/Space d and full vector-space operations (addition, negation, subtraction, scalar multiplication, zero) to enable robust linear-algebra support for physics representations. - SpaceStruct modernization and refactor: extracted core SpaceStruct into dedicated SpaceStruct.lean, consolidated definitions, updated imports, and added documentation; groundwork laid for deprecating the Space abbrev and improving code organization. Major fixes, quality improvements, and maintenance - Code quality: addressed linting issues and import fixes; added missing docstrings to improve readability and maintainability. Impact and business value - Technical impact: enhanced math expressiveness and correctness of vector-space computations; clearer module boundaries and documentation reduce technical debt and accelerate future feature work. - Business value: enables more accurate physics modeling, smoother onboarding for new engineers, and a scalable foundation for upcoming features. Technologies and skills demonstrated - Lean language features: type classes and instances (VAdd), module refactoring, and docstring practices. - Code quality and architecture: linter remediation, import hygiene, and documentation; architectural modernization with dedicated SpaceStruct.lean and deprecation planning. Top achievements - Implemented vector-space operations for Space d with a VAdd instance and full vector-space capabilities (commits 74b45f75ebb0be02f7a88457a30e2d6450453b14; 99a19db076c38d626118fb96365970999c866d3f). - Modernized SpaceStruct: moved to a dedicated SpaceStruct.lean, consolidated definitions, updated imports, and added documentation (commits de630be7b88ea07bd285ac8162686be223650362; ceb962f999b4ff65afb2e5d718f2eeef476decb5; 3794a1915b653c4c75543d3ee72680d282f84a75; 1e49547b205f926da133e856b1525a281e268973). - Quality improvements: lint cleanup, missing docstrings, and import fixes to improve long-term maintainability and ease future contributions (related commits listed above).
August 2025
July 2025
2 Commits • 1 Features
Jul 1, 2025Month 2025-07 – Summary: Delivered a structural redesign of Space in PhysLean to a proper structure (Basic.lean) to improve type safety and extensibility, with an updated inner product lemma in SpaceAndTime/Space/Basic.lean to correctly handle sums over indices and commutativity. This work strengthens the math foundation, reduces future maintenance risk, and enables smoother integration with additional modules.
July 2025
2 Commits • 1 Features
Jul 1, 2025Month 2025-07 – Summary: Delivered a structural redesign of Space in PhysLean to a proper structure (Basic.lean) to improve type safety and extensibility, with an updated inner product lemma in SpaceAndTime/Space/Basic.lean to correctly handle sums over indices and commutativity. This work strengthens the math foundation, reduces future maintenance risk, and enables smoother integration with additional modules.
November 2024
1 Commits • 1 Features
Nov 1, 2024November 2024: Delivered a codebase stylistic modernization in CliffordAlgebra within HEPLean/PhysLean by standardizing matrix literal notation from '!' to '!!' in CliffordAlgebra.lean. This change improves consistency, readability, and maintainability without altering runtime values. Implemented via a focused commit related to gamma-relations logic.
1 Commits • 1 Features
Nov 1, 2024November 2024: Delivered a codebase stylistic modernization in CliffordAlgebra within HEPLean/PhysLean by standardizing matrix literal notation from '!' to '!!' in CliffordAlgebra.lean. This change improves consistency, readability, and maintainability without altering runtime values. Implemented via a focused commit related to gamma-relations logic.
November 2024
Activity
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Quality Metrics
Correctness97.8%
Maintainability97.8%
Architecture97.8%
Performance95.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
Lean
Technical Skills
Abstract AlgebraCode OrganizationCode RefactoringDocumentationFormal VerificationLean DevelopmentMathematical ProofMathematical ProofsSoftware RefactoringType Theory
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