Lean Releases con-leche, an External Checker Proven Consistent Within Lean

Lean has introduced con-leche, an open-source external Lean checker whose own consistency is formally proven within Lean, guaranteeing it will never accept a proof of False.

2026-09-10 ~ 2026-09-11 · 2 related posts

• Lean gets con-leche: an external checker proven consistent, never accepts a proof of False — AlexKontorovich · 2026-09-10
• con-leche: an external Lean checker proven consistent (in Lean) goes open source — burny_tech · 2026-09-11