Hypergraph saturation for the bow tie

Abstract

Erdős and Sós initiated the study of the maximum size of a $k$-uniform set system, for $k\ge 4$, with no singleton intersections $50$ years ago. In this work, we investigate the dual problem: finding the minimum size of a $k$-uniform hypergraph with no singleton intersections, such that adding any missing hyperedge forces a singleton intersection. These problems, known as saturation and semi-saturation, are typically challenging. Our focus is on an elementary-to-state case in the line of work by Erdős, Füredi and Tuza. We establish tight linear bounds for $k=4$, marking one of the first non-obvious cases with such a bound.

11 pages, 2 figures