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arXiv · 2609.04596

An Improved Upper Bound for Multicolour Ramsey Numbers

Sunghyeon Jo
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Abstract

Let $R_r(k)$ denote the diagonal $r$-colour Ramsey number. We prove that there exist absolute constants $c,K>0$ such that $R_r(k)\le r^{rk}\exp\!\left(-c\frac{k}{r\log^2(2r)}\right)$ for every $r\ge2$ and every $k\ge Kr^2\log^6(2r)$. This improves the exponential saving in a recent bound of Yang and Mao by a factor of order $r\log^2(2r)$. The proof proceeds through an off-diagonal bound, which asymptotically improves the classical multinomial bound throughout a neighbourhood of the diagonal.

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Sunghyeon Jo. 2026-09-04. An Improved Upper Bound for Multicolour Ramsey Numbers. https://arxiv.org/abs/2609.04596

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