Lean (proof assistant)
Lean is a proof assistant and a functional programming language. It is based on the calculus of constructions with inductive types. It is a free and open-source software project hosted on GitHub. Development is currently supported by the nonprofit Lean Focused Research Organization (FRO).
Lean (proof assistant) - Wikipedia Jump to content From Wikipedia, the free encyclopedia Proof assistant and programming language Lean Paradigm Strict purely functional , dependently typed Family Proof assistant Designed by Leonardo de Moura Developer Lean FRO First appeared 2013 ; 13 years ago  ( 2013 ) Stable release 4.31.0 [ 1 ]   / 15 June 2026 ; 1 day ago  ( 15 June 2026 ) Typing discipline static , strong , inferred Implementation language Lean, C++ Platform x86-64 , AArch64 OS Cross-platform : Linux , macOS , Windows License Apache 2
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