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Lean is a proof assistant and a functional programming language developed primarily for formalizing mathematical theories and verifying the correctness of mathematical proofs. It was created by Leonardo de Moura and is used in both academia and industry for formal verification tasks. Key features of Lean include: 1. **Formal Language**: Lean provides a formal language in which users can write definitions, theorems, and proofs. This language is based on dependent type theory, enabling rich and expressive formulations.