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arXiv 1508.04029math.CO
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划分 $G$ 的顶点集以使 $G\\,\Box\\, H$ 成为高效开支配图

Partitioning the vertex set of $G$ to make $G\,\Box\, H$ an efficient open domination graph

Tadeja Kraner Šumenjak, Iztok Peterin, Douglas F. Rall, Aleksandra Tepeh

AI总结:

本文刻画了当 $H$ 为完全图(阶数≥3)或完全二部图时,笛卡尔积 $G\Box H$ 为高效开支配图的图 $G$,基于弱划分给出构造性刻画,并推广至 $H$ 为 4-圈或 5-圈的情形。

摘要:

如果一个图存在一个顶点子集,其开邻域划分该图的顶点集,则该图称为高效开支配图。我们刻画了当 $H$ 为阶数至少为 3 的完全图或完全二部图时,笛卡尔积 $G \Box H$ 为高效开支配图的所有图 $G$。该刻画基于 $V(G)$ 上某种类型的弱划分的存在性。对于 $H$ 为阶数至少为 3 的完全图时的树类,该刻画是构造性的。此外,当 $H$ 为 5-圈或 4-圈时,在笛卡尔积 $G \Box H$ 中刻画了一类特殊的高效开支配图。

英文摘要:

A graph is an efficient open domination graph if there exists a subset of vertices whose open neighborhoods partition its vertex set. We characterize those graphs $G$ for which the Cartesian product $G \Box H$ is an efficient open domination graph when $H$ is a complete graph of order at least 3 or a complete bipartite graph. The characterization is based on the existence of a certain type of weak partition of $V(G)$. For the class of trees when $H$ is complete of order at least 3, the characterization is constructive. In addition, a special type of efficient open domination graph is characterized among Cartesian products $G \Box H$ when $H$ is a 5-cycle or a 4-cycle.

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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