How Lean checks an AI-written proof
What it shows
A bench-top inspection gate with a tray feeding in and a tray collecting out; its green checkpoint housing stands for the small kernel that checks every step of a proof.
Its labels
- New: A small trusted kernel checks each step
- A replay of stored steps through the same check
- Whether the statement means what you intended
The story
How Lean checks an AI-written proof, and where that stops · 18 Oct 2026
An illustration is never a picture of what happened. Drawn on 18 Oct 2026.