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◈ALB Atlas

Lean Alive

Lean
KindProgramming language
Appeared2013
StatusAlive
CreatorLeonardo de Moura / Microsoft Research
FamilyML

The theorem prover mathematicians actually adopted — Lean 4 is both proof assistant and programming language, and mathlib keeps growing.

Leonardo de Moura's Lean (2013) — a theorem prover that became a language — powers mathlib, the largest formalized mathematics library, and is increasingly used for verified systems.\n\nLean 4 (2021) is a practical language; it is the intersection of mathematics and programming where the field's frontier sits.