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Homogeneous sets in hypergraphs with forbidden order-size pairs. (arXiv:2303.09578v1 [math.CO]) http://arxiv.org/abs/2303.09578

Homogeneous sets in hypergraphs with forbidden order-size pairs

The well-known Erdős-Hajnal conjecture states that for any graph $F$, there exists $ε>0$ such that every $n$-vertex graph $G$ that contains no induced copy of $F$ has a homogeneous set of size at least $n^ε$. We consider a variant of the Erdős-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 $m$ vertices and $f$ edges for any positive $m$ and $0\leq f \leq \binom{m}{2}$, then we obtain large homogeneous sets. For triple systems, in the first nontrivial case $m=4$, for every $S \subseteq \{0,1,2,3,4\}$, 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 $S$. For all $S$ we determine if the growth rate is polylogarithmic. Several open problems remain.

arxiv.org
March 20, 2023 at 3:10 AM · · feed2toot · 0 · 0 · 0
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