project

Lean4Lean

A formalization of Lean's own foundations written in Lean, used to state and prove properties of the type theory the kernel implements.

Current clusters

build2 publishers

Lean's guarantee ends at 8,000 lines of C++ and its dependencies

The Clay Mathematics Institute has the claimed Navier-Stokes solution under review, and a summer of agent-found bugs in Lean's kernel shows how narrow the guarantee a Lean certificate actually gives.

Publishers:lesswrong.comthe-decoder.com

Reality

Evidence62
Adoption60
Hype gap+30
Incentives68
Confidence58