High girth hypergraphs with unavoidable monochromatic or rainbow edges
Combinatorics
2016-08-18 v2
Abstract
A classical result of Erd\H{o}s and Hajnal claims that for any integers there is an -uniform hypergraph of girth at least with chromatic number at least . This implies that there are sparse hypergraphs such that in any coloring of their vertices with at most colors there is a monochromatic hyperedge. We show that for any integers there is an -uniform hypergraph of girth at least such that in any coloring of its vertices there is either a monochromatic or a rainbow (totally multicolored) edge. We give a probabilistic and a deterministic proof of this result.
Cite
@article{arxiv.1607.06600,
title = {High girth hypergraphs with unavoidable monochromatic or rainbow edges},
author = {Maria Axenovich and Annette Karrer},
journal= {arXiv preprint arXiv:1607.06600},
year = {2016}
}
Comments
Corrected remark to references. The paper [8] addresses both graphs and hypergraphs