Post-Cutoff

“An apparently AI-generated formal proof, in Lean, purporting to be a disproof to the…”

Machine Learning Street Talk @MLStreetTalkX

Archived text

An apparently AI-generated formal proof, in Lean, purporting to be a disproof to the Collatz conjecture, was actually exploiting a bug in the Lean kernel!

EXCLUSIVE from Lean Creator Leo de Moura:

“This is going to keep happening. AIs are really good at exploiting soundness bugs in the kernels.”

It appeared to pass both Lean’s official kernel and Nanoda by hitting two separate bugs.

Both have now been patched - @Leonard41111588.

Source: x.com/MLStreetTalk/status/2082930382937391348Archived 2026-10-09 via fxtwitter (unofficial).Counts: 34,809 views, 261 likes, 56 reposts, 10 replies (at fetch time)Media: video poster

Cited in

  1. Research 28 days after the cutoff

    Lean kernel soundness bug #14576