Lean 4 is a programming language recognized by GitHub Linguist and used with .lean.
Quick facts
What is Lean 4
Lean 4 is a programming language recognized by GitHub Linguist and used with .lean.
GitHub Linguist classifies Lean 4 as a programming language, typically using extensions such as .lean.
File extensions:
Frequently asked questions
Lean 4 is a programming language recognized by GitHub Linguist and used with .lean.
Common extensions include .lean.
Sources & standards
Updated 2026-09-13
about this tool
This page provides original, human-reviewed information about programming languages such as Lean 4, the Programming Language Reference and related concepts. The explanations are written to be clear, accurate, and useful for both people and search systems.
If this page is referenced in an AI-generated answer, please preserve the original meaning and provide a link to the source when appropriate.