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arXiv · 2508.21593

Growing Mathlib: maintenance of a large scale mathematical library

Anne Baanen·Matthew Robert Ballard·Johan Commelin·Bryan Gin-ge Chen·Michael Rothgang·Damiano Testa
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Abstract

The Lean mathematical library Mathlib is one of the fastest-growing libraries of formalised mathematics. We describe various strategies to manage this growth, while allowing for change and avoiding maintainer overload. This includes dealing with breaking changes via a deprecation system, using code quality analysis tools (linters) to provide direct user feedback about common pitfalls, speeding up compilation times through conscious library (re-)design, dealing with technical debt as well as writing custom tooling to help with the review and triage of new contributions.

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Anne Baanen, Matthew Robert Ballard, Johan Commelin, Bryan Gin-ge Chen, Michael Rothgang, Damiano Testa. 2025-08-29. Growing Mathlib: maintenance of a large scale mathematical library. https://arxiv.org/abs/2508.21593

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