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About: Lean (proof assistant)     Goto   Sponge   NotDistinct   Permalink

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Lean is a theorem prover and programming language. It is based on the calculus of constructions with inductive types. The Lean project is an open source project, hosted on GitHub. It was launched by Leonardo de Moura at Microsoft Research in 2013. Lean has an interface that differentiates it from other interactive theorem provers. Lean can be compiled to JavaScript and accessed in a web browser. It has native support for Unicode symbols. (These can be typed using LaTeX-like sequences, such as " imes" for "×".) Lean also has an extensive support for meta-programming.