arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2205.15840math.CO
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关于积图的$k$ -独立数

On the $k$-independence number of graph products

Aida Abiad, Hidde Koerts

摘要:

图的$k$ -独立数$α_k(G)$是在大于$k$的成对距离处的顶点集合的最大大小,或者可选地,第$k$次幂图的独立数$G^k$。虽然已知$α_k(G)=α(G^k)$,但这通常不适用于大多数图乘积,因此不能使用图乘积的$α$的现有界限。本文给出了几种图积的$k$ -独立数的精确上界。特别是,我们专注于笛卡尔,张量,强,和字典的产品。以前已知的一些界限在文献中的$k=1$如下作为推论,我们的主要结果。

英文摘要:

The $k$-independence number of a graph, $α_k(G)$, is the maximum size of a set of vertices at pairwise distance greater than $k$, or alternatively, the independence number of the $k$-th power graph $G^k$. Although it is known that $α_k(G)=α(G^k)$, this, in general, does not hold for most graph products, and thus the existing bounds for $α$ of graph products cannot be used. In this paper we present sharp upper bounds for the $k$-independence number of several graph products. In particular, we focus on the Cartesian, tensor, strong, and lexicographic products. Some of the bounds previously known in the literature for $k=1$ follow as corollaries of our main results.

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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