English

Ramsey numbers of cliques versus monotone paths

Combinatorics 2023-03-31 v1

Abstract

One formulation of the Erdos-Szekeres monotone subsequence theorem states that for any red/blue coloring of the edge set of the complete graph on {1,2,,N}\{1, 2, \ldots, N\}, there exists a monochromatic red ss-clique or a monochromatic blue increasing path PnP_n with nn vertices, provided N>(s1)(n1)N >(s-1)(n-1). %We had previously shown that a suitable generalization of this problem to quadruple systems is essentially equivalent to classical diagonal hypergraph Ramsey numbers. Here, we prove a similar statement as above in the off-diagonal case for triple systems, with the quasipolynomial bound N>2c(logn)s1N>2^{c(\log n)^{s-1}}. For the ttth power PntP_n^t of the ordered increasing graph path with nn vertices, we prove a near linear bound cn(logn)s2c\, n(\log n)^{s-2} which improves the previous bound that applied to a more general class of graphs than PntP_n^t due to Conlon-Fox-Lee-Sudakov.

Keywords

Cite

@article{arxiv.2303.16995,
  title  = {Ramsey numbers of cliques versus monotone paths},
  author = {Dhruv Mubayi and Andrew Suk},
  journal= {arXiv preprint arXiv:2303.16995},
  year   = {2023}
}