English

Common domination perfect graphs

Combinatorics 2022-08-16 v1

Abstract

A dominating set in a graph GG is a set SS of vertices such that every vertex that does not belong to SS is adjacent to a vertex in SS. The domination number γ(G)\gamma(G) of GG is the minimum cardinality of a dominating set of GG. The common independence number αc(G)\alpha_c(G) of GG is the greatest integer rr such that every vertex of GG belongs to some independent set of cardinality at least~rr. The common independence number is squeezed between the independent domination number i(G)i(G) and the independence number α(G)\alpha(G) of GG, that is, γ(G)i(G)αc(G)α(G)\gamma(G) \le i(G) \le \alpha_c(G) \le \alpha(G). A graph GG is domination perfect if γ(H)=i(H)\gamma(H) = i(H) for every induced subgraph HH of GG. We define a graph GG as common domination perfect if γ(H)=αc(H)\gamma(H) = \alpha_c(H) for every induced subgraph HH of GG. We provide a characterization of common domination perfect graphs in terms of ten forbidden induced subgraphs.

Keywords

Cite

@article{arxiv.2208.07092,
  title  = {Common domination perfect graphs},
  author = {Magda Dettlaff and Michael A. Henning and Jerzy Topp},
  journal= {arXiv preprint arXiv:2208.07092},
  year   = {2022}
}

Comments

11 pages, 2 figures

R2 v1 2026-06-25T01:42:33.573Z