arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.00236math.CO
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字典序积图的双控制

Double domination in lexicographic product graphs

A. Cabrera Martinez, S. Cabrera Garcia, J. A. Rodriguez-Velazquez

摘要:

在图$G$中,一个顶点支配它自己和它的邻居。一个子集$S\subseteq V(G)$称为$G$的双支配集,如果$S$支配$G$的每个顶点至少两次。$G$的所有双控制集的最小基数是双控制数。利用因子图$G$和$H$的不变量,得到了字典序积图$G\circ H$的双控制数的紧界和闭公式.

英文摘要:

In a graph $G$, a vertex dominates itself and its neighbours. A subset $S\subseteq V(G)$ 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 $G\circ H$ in terms of invariants of the factor graphs $G$ and $H$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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