Lean4.ai

Compiler-enforced evidence levels and a verified coding agent, built on Lean 4

Projects

Lean Manifests

Separate what a Lean module claims from how each claim is established. Five evidence levels (from UnprovenConjecture to ProvenTheorem), compiler-enforced, with a build-time trust report.

Architecture

l3m: Verified Coding Agent

A coding agent written in Lean 4 with kernel-verified safety: confined paths, closed tool set, call-graph reachability proofs, and a proven compression budget.

Agent

Lean 4 Resources

Lean 4

Official site, downloads, and documentation.

Official

Zulip Chat

The primary community hub for Lean discussion.

Community

Mathlib4

The community math library: 100k+ formalized theorems.

Library

Reservoir

Package index for the Lean 4 ecosystem.

Packages