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A Critical Look at Lean4

The article critically examines the Lean4 system, highlighting that it is not an ideal formal certificate machine and has significant issues. The author mentions the existence of proofs that could be accepted as bugs and warns about the potential risks associated with trusting Lean4 certificates.

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Tracking sinceOctober 9, 202653 source points
Momentum0/hover 0.55 h
PublishedOctober 9, 2026Milo Moses
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WHY IT MAY MATTER

It's important to critically assess trust in formal systems, especially if they are in development and have known issues.

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