English

A note on induced Ramsey numbers

Combinatorics 2017-11-01 v2

Abstract

The induced Ramsey number rind(F)r_{\mathrm{ind}}(F) of a kk-uniform hypergraph FF is the smallest natural number nn for which there exists a kk-uniform hypergraph GG on nn vertices such that every two-coloring of the edges of GG contains an induced monochromatic copy of FF. We study this function, showing that rind(F)r_{\mathrm{ind}}(F) is bounded above by a reasonable power of r(F)r(F). In particular, our result implies that rind(F)22ctr_{\mathrm{ind}}(F) \leq 2^{2^{ct}} for any 33-uniform hypergraph FF with tt vertices, mirroring the best known bound for the usual Ramsey number. The proof relies on an application of the hypergraph container method.

Keywords

Cite

@article{arxiv.1601.01493,
  title  = {A note on induced Ramsey numbers},
  author = {David Conlon and Domingos Dellamonica and Steven La Fleur and Vojtěch Rödl and Mathias Schacht},
  journal= {arXiv preprint arXiv:1601.01493},
  year   = {2017}
}

Comments

Dedicated to the memory of Jirka Matou\v{s}ek, 10 pages, second version addresses changes arising from the referee reports

R2 v1 2026-06-22T12:24:38.467Z