Extremal results for Berge-hypergraphs

Abstract

Let $G$ be a graph and $\mathcal{H}$ be a hypergraph both on the same vertex set. We say that a hypergraph $\mathcal{H}$ is a \emph{Berge}-$G$ if there is a bijection $f:E(G)\to E(\mathcal{H})$ such that for $e\in E(G)$ we have $e\subset f(e)$. This generalizes the established definitions of "Berge path" and "Berge cycle" to general graphs. For a fixed graph $G$ we examine the maximum possible size (i.e.\ the sum of the cardinality of each edge) of a hypergraph with no Berge-$G$ as a subhypergraph. In the present paper we prove general bounds for this maximum when $G$ is an arbitrary graph. We also consider the specific case when $G$ is a complete bipartite graph and prove an analogue of the K\H ovári-Sós-Turán theorem.

References in corpus (1)

• An Anti-Ramsey Problem Concerning Complete Bipartite Graphs