Identifying Secure Domination in the Cartesian and Lexicographic Products of Graphs

Let G be a connected simple graph. A subset S of V (G) is a dominating set of G if for every v∈V (G), there exists x∈S such that xv∈E (G). An identifying code of a graph G is a dominating set C⊆V (G) such that for every v∈V (G), NG v∩C is distinct. An identifying code of a graph G is an identifying secure dominating set if for each u∈V (G), there exists v∈C such that uv∈E (G) and the set (C\v) ∪u is a dominating set of G. The minimum cardinality of an identifying secure dominating set of G, denoted by γₛID, is called the identifying secure domination number of G. In this paper, the researchers initiate the study of the concept and give some important results. In particular, the researchers show some properties of the identifying secure dominating sets in the Cartesian product and lexicographic product of two connected graphs.