English

Homogeneous sets in hypergraphs with forbidden order-size pairs

Combinatorics 2023-03-20 v1

Abstract

The well-known Erd\H{o}s-Hajnal conjecture states that for any graph FF, there exists ϵ>0\epsilon>0 such that every nn-vertex graph GG that contains no induced copy of FF has a homogeneous set of size at least nϵn^{\epsilon}. We consider a variant of the Erd\H{o}s-Hajnal problem for hypergraphs where we forbid a family of hypergraphs described by their orders and sizes. For graphs, we observe that if we forbid induced subgraphs on mm vertices and ff edges for any positive mm and 0f(m2)0\leq f \leq \binom{m}{2}, then we obtain large homogeneous sets. For triple systems, in the first nontrivial case m=4m=4, for every S{0,1,2,3,4}S \subseteq \{0,1,2,3,4\}, we give bounds on the minimum size of a homogeneous set in a triple system where the number of edges spanned by every four vertices is not in SS. For all SS we determine if the growth rate is polylogarithmic. Several open problems remain.

Keywords

Cite

@article{arxiv.2303.09578,
  title  = {Homogeneous sets in hypergraphs with forbidden order-size pairs},
  author = {Maria Axenovich and Dhruv Mubayi and Lea Weber},
  journal= {arXiv preprint arXiv:2303.09578},
  year   = {2023}
}
R2 v1 2026-06-28T09:20:37.596Z