Lean

Lean is both a functional programming language and a modern proof assistant. Its Mathlib library has gathered a large community of mathematicians formalizing theorems, and it's gaining ground over Coq for its ergonomics.

• Creado por Leonardo de Moura (Microsoft)
• Año 2013
• Paradigma: Functional · proof assistant
• Extensiones: .lean

Para qué se usa

• Formalizing mathematics
• Verification
• Research

A favor

• Modern and ergonomic
• Large community (Mathlib)
• Functional and proofs

En contra

• Very steep curve
• Academic niche
• Rapidly evolving

Ecosistema

• Mathlib
• Lean 4
• Lake

Ejemplo

def main : IO Unit :=
  IO.println "¡Hola, mundo!"