
Jeremy Lindsay contributed to the HEPLean/PhysLean repository by developing and formalizing core mathematical structures in Lean, focusing on the Lorentz group and its subgroups. He introduced and normalized the restricted Lorentz group, proving its closure, inverse, and normality properties, and later established its equivalence with the identity component. Jeremy refactored and reorganized Lorentz-related modules, updated Minkowski product definitions, and standardized naming conventions to improve maintainability and clarity. His work leveraged skills in abstract algebra, group theory, and formal verification, resulting in a more robust mathematical foundation and clearer documentation for future physics-mathematics development within the project.
In 2025-06, delivered a core mathematical feature for HEPLean/PhysLean: establishing that the restricted Lorentz group is equivalent to the identity component. This work involved refactoring and reorganizing Lorentz-related modules, introducing generalized boosts, updating Minkowski product definitions, and standardizing file/lemma naming for consistency. All changes were committed in 6ddb4b1d632fca0c31ddd0e20c08141eb920e310 with a clear feature-focused message. No critical bugs were reported this month. Overall, the work strengthens the theoretical correctness of the Lorentz module, improves maintainability and readability, and lays the groundwork for future extensions and more robust physics computations.
In 2025-06, delivered a core mathematical feature for HEPLean/PhysLean: establishing that the restricted Lorentz group is equivalent to the identity component. This work involved refactoring and reorganizing Lorentz-related modules, introducing generalized boosts, updating Minkowski product definitions, and standardizing file/lemma naming for consistency. All changes were committed in 6ddb4b1d632fca0c31ddd0e20c08141eb920e310 with a clear feature-focused message. No critical bugs were reported this month. Overall, the work strengthens the theoretical correctness of the Lorentz module, improves maintainability and readability, and lays the groundwork for future extensions and more robust physics computations.
April 2025 (HEPLean/PhysLean) delivered: documentation enhancements for index notation and Lorentz resources; code refactors to remove erwt usage across LinearMaps.lean, Lorentz folder, and PauliMatrices module; introduction and normalization of the Restricted Lorentz group with proofs of closure, inverse, and normality; plus a fix for a broken dead Lorentz reference link. These changes improve maintainability, onboarding, and provide a solid mathematical foundation for future physics-math work.
April 2025 (HEPLean/PhysLean) delivered: documentation enhancements for index notation and Lorentz resources; code refactors to remove erwt usage across LinearMaps.lean, Lorentz folder, and PauliMatrices module; introduction and normalization of the Restricted Lorentz group with proofs of closure, inverse, and normality; plus a fix for a broken dead Lorentz reference link. These changes improve maintainability, onboarding, and provide a solid mathematical foundation for future physics-math work.

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