English

Bounding the edge cover of a hypergraph

Combinatorics 2021-08-27 v2

Abstract

Let H=(V,E)H=(V,E) be a hypergraph. Let CEC\subseteq E, then CC is an {\it edge cover}, or a {\it set cover}, if eC{vve}=V\cup_{e\in C} \{v|v\in e\}=V. A subset of vertices XX is {\it independent} in H,H, if no two vertices in XX are in any edge. Let c(H)c(H) and α(H)\alpha(H) denote the cardinalities of a smallest edge cover and largest independent set in HH, respectively. We show that c(H)m^(h)c(H)c(H)\le {\hat m}(h)c(H), where m^(H){\hat m}(H) is a parameter called the {\it mighty degeneracy} of HH. Furthermore, we show that the inequality is tight and demonstrate the applications in domination theory.

Keywords

Cite

@article{arxiv.2108.07984,
  title  = {Bounding the edge cover of a hypergraph},
  author = {Farhad Shahrokhi},
  journal= {arXiv preprint arXiv:2108.07984},
  year   = {2021}
}

Comments

This is a revised version of the paper [Bounding the edge cover of a hypergraph] recently posted on arXiv

R2 v1 2026-06-24T05:12:42.458Z