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Helper toolkit for creating your own Lean 4 UserWidgets

Last commit Jul 22, 2026

 (219 stars) (45 forks) (4 indexed issues) (4 open good first issues)

The "batteries included" extended library for the Lean programming language and theorem prover

Last commit Jul 16, 2026

 (406 stars) (154 forks) (2 indexed issues) (2 open good first issues)

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

Last commit Oct 30, 2023

 (1,667 stars) (290 forks) (0 indexed issues) (0 open good first issues)

The math library of Lean 4

Last commit Jun 7, 2026

 (3,405 stars) (1,381 forks) (16 indexed issues) (16 open good first issues)

A project to digitalise results from physics into Lean.

Last commit Jul 11, 2026

 (642 stars) (139 forks) (3 indexed issues) (3 open good first issues)