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Double domination critical and stable graphs upon vertex removal

Soufiane Khelifi; Mustapha Chellali — 2012

Discussiones Mathematicae Graph Theory

In a graph a vertex is said to dominate itself and all its neighbors. A double dominating set of a graph G is a subset of vertices that dominates every vertex of G at least twice. The double domination number of G, denoted $γ_{\times 2} (G)$ , is the minimum cardinality among all double dominating sets of G. We consider the effects of vertex removal on the double domination number of a graph. A graph G is $γ_{\times 2}$ -vertex critical graph ( $γ_{\times 2}$ -vertex stable graph, respectively) if the removal of any vertex different from a support...

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