Developer builds first formally verified 3D mesh intersection using Lean 4 and AI

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A developer has created what is claimed to be the first formally verified 3D constructive solid geometry (CSG) mesh intersection operation, implemented in the Lean 4 proof assistant. The project uses a 93-line human-readable formal specification that fully defines the resulting mesh surface and its triangulation properties. An AI agent autonomously generated over 60,000 lines of Lean proofs and more than 1,000 lines of implementation code, neither of which requires human review. The Lean checker validates conformance to the specification at compile time, placing no trust in the AI-generated code itself. A live web demo running the verified kernel compiled to WebAssembly is publicly available.

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