Lean 4 programming language and theorem prover

Theorem Proving in Lean 4

The user home repository for the Mathematics in Lean tutorial.

The math library of Lean 4

Formalizing Euclidean Geometry in Lean

Lean theorem proving interface which feels like pen-and-paper proofs.

Repository for the Stacks Project

feat(Field): add theorems in Stacks Project Chapter 09FA Fields

Markdown file of the list and explanations of all mathlib4 tactics

Repository for formalization of filtered ring

コード例で学ぶ Lean 言語

Examples using MetaProgramming for writing tactics etc.