# Erdős Problem 921

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:921
- Collection: Erdős
- Page: https://qed.bot/s/erdos-921
- Formal record: solved; at its source: proved
- Machine-checked: no independent check has verified it
- Fidelity F2: The statement corpus cites this proof against its own statement.
- Source: https://www.erdosproblems.com/921

## AI claims

No AI contribution is recorded against this statement.

## Formal statements

- FormalConjectures/ErdosProblems/921.lean, https://github.com/google-deepmind/formal-conjectures/blob/main/FormalConjectures/ErdosProblems/921.lean

Cite as: qed.bot, "Erdős Problem 921", https://qed.bot/s/erdos-921, as of 30 Sep 2026. The register's data is published under CC BY 4.0: https://creativecommons.org/licenses/by/4.0/