Explaining Mistral's Formal Proof System Leanstral
sophiamyang · x · 2026-07-05
The author distinguishes between "testing" and "proving": testing only verifies the inputs you've tried, whereas a proof (written in Lean and computer-verified) asserts that a property holds for all inputs. Leanstral, Mistral's proof-writing system, can edit proofs, read checker errors, and iteratively retry, but it cannot guarantee correctness on its own—it must pass Lean verification. The thread systematically explains the concepts and toolchain behind formal verification.
Related event: Mistral Releases Open-Source Lean 4 Proving Agent Leanstral 1.5(5 posts)→
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