Protection of Lexicographic Product Graphs
Discussiones Mathematicae. Graph Theory, Tome 42 (2022) no. 1, pp. 139-158

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In this paper, we study the weak Roman domination number and the secure domination number of lexicographic product graphs. In particular, we show that these two parameters coincide for almost all lexicographic product graphs. Furthermore, we obtain tight bounds and closed formulas for these parameters.
Keywords: lexicographic product, weak Roman domination, secure domination, total domination, double total domination
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Klein, Douglas J.; Rodríguez-Velázquez, Juan A. Protection of Lexicographic Product Graphs. Discussiones Mathematicae. Graph Theory, Tome 42 (2022) no. 1, pp. 139-158. http://geodesic.mathdoc.fr/item/DMGT_2022_42_1_a9/