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A cyclic non-Ramsey heptagon

Dömötör Pálvölgyi

Source record

Source: arXiv

Published: Sep 20, 2026

arXiv: 2609.23327

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Source abstract

We present a construction with seven points on a circle that is not Ramsey, disproving a conjecture of Erdős, Graham, Montgomery, Rothschild, Spencer and Straus.

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A cyclic non-Ramsey heptagon — Mathematical Frontier Network