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Claus Fieker

PROFILE

Claus Fieker

Over 16 months, this developer advanced algebraic computation in Julia, focusing on the thofma/Hecke.jl and oscar-system/Oscar.jl repositories. They engineered features for number field computations, matrix operations, and group theory, emphasizing correctness, performance, and maintainability. Their work included optimizing sparse Hermite Normal Form algorithms, refining p-adic and q-adic unit group logic, and enhancing Galois group and abelian group computations. They addressed edge cases in polynomial root finding, improved documentation, and expanded test coverage to ensure reliability. Leveraging skills in Julia programming, algorithm optimization, and computational algebra, they delivered robust, extensible tooling for advanced mathematical and research workflows.

Overall Statistics

Feature vs Bugs

56%Features

Repository Contributions

50Total
Bugs
19
Commits
50
Features
24
Lines of code
9,256
Activity Months16

Work History

March 2026

3 Commits • 3 Features

Mar 1, 2026

March 2026 focused on delivering core mathematical workflow enhancements in thofma/Hecke.jl, combining visualization improvements, algebraic number theory capabilities, and group-theoretic functionality to strengthen research pipelines. The work emphasizes practical business value by reducing manual effort, enabling faster insight, and broadening integration with algebraic workflows.

February 2026

3 Commits • 1 Features

Feb 1, 2026

February 2026 performance summary highlighting key software delivery across two repositories, with emphasis on robust group theory capabilities and correctness of number-theoretic constructs.

January 2026

7 Commits • 2 Features

Jan 1, 2026

Concise monthly summary for 2026-01 covering delivered features, critical fixes, and overall impact across thofma/Hecke.jl and oscar-system/Oscar.jl. Focused on business value and robust technical achievements, including API clarity, reliability of algebraic computations, and broader test coverage.

December 2025

4 Commits • 2 Features

Dec 1, 2025

December 2025—thofma/Hecke.jl monthly highlights: delivered key features in abelian group computations with performance and robustness improvements; added fractional ideals support in Ray Class Group calculations; foundational work to enhance numerical capabilities and prepare for larger-scale analyses. Emphasized reliability, performance, and extensibility to support advanced number theory workflows.

November 2025

2 Commits • 2 Features

Nov 1, 2025

November 2025 monthly summary for thofma/Hecke.jl focused on feature enhancements and robustness in arithmetic tooling for p-adic and q-adic unit groups. Key work includes refining gcdx-based handling of one-units, adding prime 2-specific logic, and expanding tests; and revamping number field elements and norms for relative fields with attention to S-units, LLL reduction, and norm equations. No major bugs reported; instead, significant test coverage and reliability improvements were achieved. This lays groundwork for more robust class group computations in relative fields and strengthens the overall arithmetic capabilities of the library.

October 2025

3 Commits • 1 Features

Oct 1, 2025

Concise monthly summary for 2025-10 focusing on key accomplishments in thofma/Hecke.jl. The updates emphasize delivering a feature enabling richer multiplicative group handling and hardening prime-related arithmetic against FLINT_IMPINV errors.

September 2025

5 Commits • 2 Features

Sep 1, 2025

Month 2025-09 — Concise monthly summary focusing on key accomplishments, business impact, and technical achievements across Hecke.jl and Oscar.jl.

August 2025

6 Commits • 2 Features

Aug 1, 2025

August 2025 monthly summary for thofma/Hecke.jl: Delivered key feature improvements and targeted bug fixes with an emphasis on reliability, broader applicability, and maintainability. The work enhances algebraic correctness in matrix operations and torsion unit handling, extends rational-matrix support, and updates Julia/Nemo compatibility, complemented by test and documentation improvements to ensure robust usage across versions.

July 2025

5 Commits • 1 Features

Jul 1, 2025

July 2025 performance summary: Focused on correctness and robustness of core algebraic computations across thofma/Hecke.jl and oscar-system/Oscar.jl, delivering one new feature and multiple reliability fixes with expanded test coverage to reduce edge-case failures and improve long-term maintainability. Key outcomes include stabilized isomorphism checks, more reliable polynomial and radical computations, and hardened Galois group calculations, enabling more trustworthy results for research and production workflows.

June 2025

1 Commits

Jun 1, 2025

June 2025 monthly summary for thofma/Hecke.jl: Implemented a targeted bug fix to polynomial root finding over QQBar.jl, improving correctness and reliability of algebraic-number computations. This work addresses edge cases with zero coefficients and eliminates spurious roots introduced by the norm operation, while ensuring zero roots are included when appropriate. The change enhances accuracy for downstream workflows that rely on robust root finding.

May 2025

3 Commits • 2 Features

May 1, 2025

May 2025 performance summary across two Julia repositories, focusing on delivering business value through robust features, bug fixes, and technical excellence.

March 2025

2 Commits • 1 Features

Mar 1, 2025

March 2025 monthly summary for thofma/Hecke.jl focusing on performance improvements in sparse HNF and robust handling in sparse matrices.

February 2025

2 Commits • 2 Features

Feb 1, 2025

February 2025 (2025-02): thofma/Hecke.jl delivered focused improvements in documentation clarity for quotient ring operations and introduced performance instrumentation in the HNF path to enable targeted debugging and optimization. The work enhances user understanding, accelerates issue diagnosis, and lays groundwork for future performance gains in lattice-based algorithms.

January 2025

1 Commits • 1 Features

Jan 1, 2025

January 2025: Delivered foundational G-module enhancements in Oscar.jl, enabling robust G-module homomorphisms, elements, and improved module operations. Strengthened handling of group extensions and their isomorphisms, with a refactor focused on correctness and maintainability. The changes lay groundwork for expanded algebraic modeling and more reliable computations in downstream projects, driving business value through improved reliability and extensibility.

December 2024

2 Commits • 1 Features

Dec 1, 2024

December 2024 delivered targeted correctness fixes and performance enhancements across two core algebraic toolchains. Fixed a Galois group blow_up multiplicity ordering bug in Oscar.jl, improving root-mapping accuracy and preserving factor multiplicities. Implemented high-performance determinant and matrix multiplication enhancements in Hecke.jl (Det.jl and strassen.jl), employing adaptive rational reconstruction and Strassen’s algorithm to speed up large-matrix computations. Together, these changes improve reliability, scalability, and throughput for algebraic workloads, enabling more accurate analyses and faster research iterations.

November 2024

1 Commits • 1 Features

Nov 1, 2024

November 2024 monthly summary for thofma/Hecke.jl development focusing on delivering robust number field computations and expanding non-maximal order capabilities.

Activity

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Quality Metrics

Correctness87.6%
Maintainability83.2%
Architecture81.2%
Performance76.6%
AI Usage20.4%

Skills & Technologies

Programming Languages

Julia

Technical Skills

Abstract AlgebraAlgebraic GeometryAlgebraic Number TheoryAlgorithm DevelopmentAlgorithm ImplementationAlgorithm OptimizationAlgorithm RefactoringAlgorithm RefinementComputational AlgebraComputational Group TheoryComputational MathematicsComputer AlgebraDebuggingDocumentationError Handling

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

thofma/Hecke.jl

Nov 2024 Mar 2026
15 Months active

Languages Used

Julia

Technical Skills

Abstract AlgebraAlgorithm DevelopmentComputational AlgebraNumber TheorySymbolic ComputationAlgorithm Optimization

oscar-system/Oscar.jl

Dec 2024 Feb 2026
7 Months active

Languages Used

Julia

Technical Skills

Abstract AlgebraComputational MathematicsNumber TheoryComputational AlgebraGroup TheoryHomological Algebra