# Erdős Problem 647

A statement in qed.bot, the register of claims of AI work in mathematics. The register grades the evidence attached to each claim; it never rules on whether a proof is correct.

- Identifier: erdos:647
- Collection: Erdős
- Page: https://qed.bot/s/erdos-647
- Formal record: mixed; at its source: verifiable
- Prize: £25
- Machine-checked: no independent check has verified it
- Fidelity F1: A formal artifact exists, but nothing records that its statement says what the claim says.
- Source: https://www.erdosproblems.com/647

## AI claims

### ChatGPT Deep research, DeepSeek DeepThink, Gemini, 28 Jan 2026

Incorrect proof found

- Outcome: incorrect
- Autonomy A3: Autonomous. The system produced the result without significant human mathematical involvement.
- Evidence V1: Informal. A public write-up exists and has had community scrutiny.
- Fidelity F1: Unaudited. A formal artifact exists, but nothing records that its statement says what the claim says.
- Source: Erdős problems AI wiki, https://github.com/teorth/erdosproblems/wiki/AI-contributions-to-Erd%C5%91s-problems

## Formal statements

- FormalConjectures/ErdosProblems/647.lean, https://github.com/google-deepmind/formal-conjectures/blob/main/FormalConjectures/ErdosProblems/647.lean

Cite as: qed.bot, "Erdős Problem 647", https://qed.bot/s/erdos-647, as of 30 Sep 2026. The register's data is published under CC BY 4.0: https://creativecommons.org/licenses/by/4.0/