The possible cardinalities of global secure sets in cographs

  • Authors:
  • Katarzyna Jesse-Józefczyk

  • Affiliations:
  • -

  • Venue:
  • Theoretical Computer Science
  • Year:
  • 2012

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Abstract

Let G=(V,E) be a graph. A global secure set SD@?V is a dominating set which also satisfies a condition that |N[X]@?SD|=|N[X]-SD| for every subset X@?SD. The minimum cardinality of the global secure set in the graph G is denoted by @c"s(G). In this paper, we introduce the notion of @c"s-monotone graphs. The graph G is @c"s-monotone if, for every k@?{@c"s(G),@c"s(G)+1,...,n}, it has a global secure set of cardinality k. We will also present the results concerning the minimum cardinality of the global secure sets in the class of cographs.