On the super domination number of graphs

The open neighborhood of a vertex v of a graph G is the set N(v) consisting of all vertices adjacent to v in G. For D ⊆ V (G), we define D = V (G) \ D. A set D ⊆ V (G) is called a super dominating set of G if for every vertex u ∈ D, there exists v ∈ D such that N(v) ∩ D = {u}. The super domination number of G is the minimum cardinality among all super dominating sets of G. In this paper, we obtain closed formulas and tight bounds for the super domination number of G in terms of several invariants of G. We also obtain results on the super domination number of corona product graphs and Cartesian product graphs.