FICHA · AUR

lean

Lean 4 programming language and theorem prover

  • theorem-prover
  • CLI
  • Dev
  • EDUCATION
  • Launchable
  • Runs in terminal
official+codex · reviewed · Jun 1, 2026 description in en

Description

Formal proofs and verified programs can be written with the Lean 4 language and theorem prover. It is useful for mathematicians, researchers, and developers working on proof assistants or formally checked code.

Proof projects often depend on exact toolchain versions and libraries. Keep projects under version control and match the version expected by the project or course material.

How to run

lean

Commands: lean

Permissions

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