English

Set-coloring Ramsey numbers and error-correcting codes near the zero-rate threshold

Combinatorics 2023-08-15 v2 Discrete Mathematics Information Theory math.IT

Abstract

For positive integers n,r,sn,r,s with r>sr > s, the set-coloring Ramsey number R(n;r,s)R(n;r,s) is the minimum NN such that if every edge of the complete graph KNK_N receives a set of ss colors from a palette of rr colors, then there is a subset of nn vertices where all of the edges between them receive a common color. If nn is fixed and sr\frac{s}{r} is less than and bounded away from 11n11-\frac{1}{n-1}, then R(n;r,s)R(n;r,s) is known to grow exponentially in rr, while if sr\frac{s}{r} is greater than and bounded away from 11n11-\frac{1}{n-1}, then R(n;r,s)R(n;r,s) is bounded. Here we prove bounds for R(n;r,s)R(n;r,s) in the intermediate range where sr\frac{s}{r} is close to 11n11 - \frac{1}{n-1} by establishing a connection to the maximum size of error-correcting codes near the zero-rate threshold.

Keywords

Cite

@article{arxiv.2305.14132,
  title  = {Set-coloring Ramsey numbers and error-correcting codes near the zero-rate threshold},
  author = {David Conlon and Jacob Fox and Huy Tuan Pham and Yufei Zhao},
  journal= {arXiv preprint arXiv:2305.14132},
  year   = {2023}
}