Lean
Open-source proof assistant for formally verified mathematics and code.
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What it is
Lean is an open-source programming language and interactive theorem prover developed by the Lean FRO. Paired with its Mathlib library, it has become the standard verification layer for AI-generated mathematics: a proof that compiles without `sorry` is machine-checked rather than merely persuasive. Used in recent AI-for-math results from OpenAI, Google DeepMind, and independent researchers.
How AI plugs in
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