As of: 2026-10-12 22:30 CEST.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code). Human editor: Adam Bicz.
Canonical page: https://postcutoff.com/v/adem-b10-openai-verified-navier-stokes-proof-not-in-paper/

# OpenAI's Verified Navier-Stokes Proof Isn't the One in the Paper

Adem B10, 11 October 2026, YouTube. 32,217 views as of 12 October 2026.
Kind: Review.
Watch: https://www.youtube.com/watch?v=IJLgSMbZjdI

## Why it is here

Nine-minute explainer of the 'lost in translation' critique (King's College London and Cambridge authors) of OpenAI's Lean-checked Navier–Stokes proof.

## Description (written by Gemini from the video)

**Summary**  
In this video, creator Adem B10 investigates a critical discrepancy in OpenAI's computer-verified Navier–Stokes blow-up proof, following an analysis paper by mathematicians Alexander Bastounis, Fabian Circelli, and Anders C. Hansen. He explains how automated AI translation into the Lean theorem prover can produce a valid machine check for an altered proof rather than the original natural-language manuscript, and explores why verifying translation faithfulness is fundamentally undecidable.

**What is shown**  
* [00:00] Overview of OpenAI's September 5 Navier–Stokes blow-up claim generated by 10,000 AI agents and verified via Lean.
* [00:30] Pedro Domingos's X post from October 8, 2026, linking to the arXiv preprint *"Navier-Stokes lost in translation: Why Lean verification of AI autoformalisation does not guarantee correct natural language proofs."*
* [02:23] Walkthrough of an introductory toy error: an invalid factorization of $p(x) = x^3 - x^2 - x + 1$ as $(x-1)(x+1)^2$, which GPT-6 Astra silently corrected to $(x-1)^2(x+1)$ when autoformalising to Lean [03:01].
* [03:34] Comparison of Lemma 8.6 in OpenAI's paper (requiring 4 additional derivatives) versus the Lean formalization `norm_derivativeWord_inverse_le` (which requires 5 additional derivatives) [03:55].
* [04:36] Discrepancy highlighted in equation (10.19) regarding bounds on pressure between the natural language manuscript and the Lean code.
* [05:35] Discussion of theoretical limits on automated translation verification, citing Alan Turing's halting problem (1936) and Hilbert's 10th problem (1970).
* [06:58] Mention of OpenAI pulling three papers from its 722-paper release due to audit-detected sign errors in unverified manuscripts.
* [07:16] Screenshot of a comment on Terence Tao's blog arguing the paper's headline is "a bit misleading" because the differences lie in intermediate steps rather than the overarching theorem formulation.
* [07:47] Checklist of three questions to evaluate whenever a paper claims to be "verified by computer."

**Claims & numbers**  
* The presenter states that inside OpenAI, about 10,000 AI agents worked on Navier–Stokes for days before claiming a proof on September 5 [00:02].
* Pedro Domingos's post on X received over 200,000 views [00:29].
* The authors of the critical paper are Bastounis, Circelli, and Hansen from Cambridge and King's College London [00:54].
* The presenter claims 42% of the results in OpenAI's major mathematics release rely on Lean verification [01:04].
* In Lemma 8.6, the paper claims 4 additional derivatives are required ($m + 4$), whereas Lean checks require 5 ($m + 5$) [03:48].
* The presenter notes that OpenAI recently pulled 3 manuscripts out of its 722-paper mathematics release due to sign errors discovered during internal audits [06:45, 06:58].

**Notable quotes**  
* "Surprise: the verified Navier-Stokes proof doesn't match the one in the paper." — Pedro Domingos (quoting the post) [00:30]
* "When we say verified, what we really know is that the French is perfect. Not that it says what you wrote." — Adem B10 [02:07]
* "A yes from the computer can never, on its own, prove the translation was faithful. Somebody still has to read both." — Adem B10 [06:33]

**Assessment**  
This is an analytical explainer and review of a recent arXiv paper critiquing autoformalisation in OpenAI's mathematical proofs. The visuals are clean hand-drawn animations and authenticated document screenshots illustrating technical points directly discussed by the presenter.

_Described by gemini-3.8-flash on 2026-10-12 from the video's audio and frames._

## Related

- 2026-10-06: [OpenAI releases 722 AI-written math manuscripts claiming hundreds of open problems](https://postcutoff.com/e/2026-10-06-openai-math-release-722-manuscripts/)
- 2026-09-08: [OpenAI claims a Millennium Prize problem](https://postcutoff.com/e/2026-09-08-openai-navier-stokes-blowup/)

## People in it

- [Terence Tao](https://postcutoff.com/person/terence-tao/), Professor of mathematics, UCLA