English

A note on hitting maximum and maximal cliques with a stable set

Discrete Mathematics 2012-05-29 v2 Combinatorics

Abstract

It was recently proved that any graph satisfying ω>23(Δ+1)\omega > \frac 23(\Delta+1) contains a stable set hitting every maximum clique. In this note we prove that the same is true for graphs satisfying ω23(Δ+1)\omega \geq \frac 23(\Delta+1) unless the graph is the strong product of Kω/2K_{\omega/2} and an odd hole. We also provide a counterexample to a recent conjecture on the existence of a stable set hitting every sufficiently large maximal clique.

Keywords

Cite

@article{arxiv.1109.3092,
  title  = {A note on hitting maximum and maximal cliques with a stable set},
  author = {Demetres Christofides and Katherine Edwards and Andrew D. King},
  journal= {arXiv preprint arXiv:1109.3092},
  year   = {2012}
}

Comments

7 pages, two figures, accepted to J. Graph Theory

R2 v1 2026-06-21T19:04:43.164Z