arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2407.09332math.CO
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图中的$k$-联盟

$k$-Coalitions in Graphs

Abbas Jafari, Saeid Alikhani, Davood Bakhshesh

AI总结:

本文提出图的$k$-联盟及$k$-联盟划分、$k$-联盟数的概念,研究其性质与图参数关联,得到特定图的2-联盟数精确值并分析大2-联盟数的图。

摘要:

本文提出并研究了图中$k$-联盟的概念,其中$k\ge1$为整数。$k$-联盟指一对不相交的顶点集,二者共同构成图的$k$-控制集,即不在该集合中的每个顶点在集合内至少有$k$个邻居。我们将图的$k$-联盟划分定义为一种顶点划分,其中每个集合要么是恰好包含$k$个成员的$k$-控制集,要么与划分中的另一个集合构成$k$-联盟。$k$-联盟划分中集合的最大数量称为图的$k$-联盟数,用$C_k(G)$表示。我们给出了关于$k$-联盟性质及其与其他图参数关联的基础结论,得到了若干特定图的2-联盟数精确值,还研究了具有较大2-联盟数的图。

英文摘要:

In this paper, we propose and investigate the concept of $k$-coalitions in graphs, where $k\ge 1$ is an integer. A $k$-coalition refers to a pair of disjoint vertex sets that jointly constitute a $k$-dominating set of the graph, meaning that every vertex not in the set has at least $k$ neighbors in the set. We define a $k$-coalition partition of a graph as a vertex partition in which each set is either a $k$-dominating set with exactly $k$ members or forms a $k$-coalition with another set in the partition. The maximum number of sets in a $k$-coalition partition is called the $k$-coalition number of the graph represented by $C_k(G)$. We present fundamental findings regarding the properties of $k$-coalitions and their connections with other graph parameters. We obtain the exact values of $2$-coalition number of some specific graphs and also study graphs with large $2$-coalition number.

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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