Double domination in lexicographic product graphs

Identificador:  imarina:6232285

Handle: https://hdl.handle.net/20.500.11797/imarina6232285

Autors:  Cabrera Martinez, Abel; Cabrera Garcia, Suitberto; Rodriguez-Velazquez, J A

Resum:
© 2020 Elsevier B.V. In a graph G, a vertex dominates itself and its neighbours. A subset S⊆V(G) is said to be a double dominating set of G if S dominates every vertex of G at least twice. The minimum cardinality among all double dominating sets of G is the double domination number. In this article, we obtain tight bounds and closed formulas for the double domination number of lexicographic product graphs G∘H in terms of invariants of the factor graphs G and H.