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Lean Theorem Prover

Important Lean 3.4.2 is the latest release. It is also the last release for the Lean 3.x code base. We are currently developing Lean 4. For reporting bugs and bug fixes in Lean 3.x, please go to the community branch.

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Installation

Stable and nightly binary releases of Lean are available on the homepage. For building Lean from source, see the build instructions.