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Mathlib3

Lean 3's obsolete mathematical components library: please use mathlib4

From leanprover-community·Updated June 23, 2026·View on GitHub·
·Archived

> [!WARNING] > Lean 3 and Mathlib 3 are no longer actively maintained. > It is strongly recommended that you use [mathlib4](https://github.com/leanprover-community/mathlib4) for Lean 4 instead. The project is written primarily in Lean, distributed under the Apache License 2.0 license, first published in 2017. It has gained significant community traction with 1,665 stars and 290 forks on GitHub. Key topics include: formal-mathematics, formal-methods, formal-proofs, lean, proof-automation.

Lean 3's mathlib

[!WARNING]
Lean 3 and Mathlib 3 are no longer actively maintained.
It is strongly recommended that you use mathlib4 for Lean 4 instead.

(If you need to read the old README.md, please see OLD_README.md.)

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This article is auto-generated from leanprover-community/mathlib3 via the GitHub API.Last fetched: 6/25/2026