Lower Bounds on the Distance Domination Number of a Graph
DOI:
https://doi.org/10.11575/cdm.v12i2.62487Keywords:
Mathematics, Discrete Mathematics, Graph Theory, Domination NumberAbstract
For an integer $k \ge 1$, a (distance) $k$-dominating set of a connected graph $G$ is a set $S$ of vertices of $G$ such that every vertex of $V(G) \setminus S$ is at distance at most~$k$ from some vertex of $S$. The $k$-domination number, $\gamma_k(G)$, of $G$ is the minimum cardinality of a $k$-dominating set of $G$. In this paper, we establish lower bounds on the $k$-domination number of a graph in terms of its diameter, radius, and girth. We prove that for connected graphs $G$ and $H$, $\gamma_k(G \times H) \ge \gamma_k(G) + \gamma_k(H) -1$, where $G \times H$ denotes the direct product of $G$ and $H$.References
address: http://cms.dt.uh.edu/faculty/delavinae/research/wowII
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