arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1709.04720math.CO
收藏

关于$k$ -支配独立集最大个数的一个改进

An improvement on the maximum number of $k$-Dominating Independent Sets

Dániel Gerbner, Balázs Keszegh, Abhishek Methuku, Balázs Patkós, Máté Vizer

摘要:

Erdés和Moser提出了一个问题,确定最大团的最大数目,或者等价地,确定图中$n$顶点上的最大独立集的最大数目。从那时起,沿着这条路线进行了大量的研究。一个$k$ -支配独立集是一个独立集$D$,使得每个不包含在$D$中的顶点在$D$中至少有$k$邻居。设$mi_k(n)$表示图中$n$顶点上$k$ -控制独立集的最大个数,设$ζ_k:=\lim_{n \rightarrow \infty} \sqrt[n]{mi_k(n)}$ . Nagy发起了$mi_k(n)$的研究。本文证明了Nagy的一个猜想是错误的,并证明了对于任何偶数$k$,我们都有$$1.489 \approx \sqrt[9]{36} \le ζ^k_k.$$。我们还证明了对于任何$k \ge 3$,我们都有$$ζ_k^{k} \le 2.053^{\frac{1}{1.053+1/k}}< 1.98,$$改进Nagy的上界。

英文摘要:

Erdős and Moser raised the question of determining the maximum number of maximal cliques or equivalently, the maximum number of maximal independent sets in a graph on $n$ vertices. Since then there has been a lot of research along these lines. A $k$-dominating independent set is an independent set $D$ such that every vertex not contained in $D$ has at least $k$ neighbours in $D$. Let $mi_k(n)$ denote the maximum number of $k$-dominating independent sets in a graph on $n$ vertices, and let $ζ_k:=\lim_{n \rightarrow \infty} \sqrt[n]{mi_k(n)}$. Nagy initiated the study of $mi_k(n)$. In this article we disprove a conjecture of Nagy and prove that for any even $k$ we have $$1.489 \approx \sqrt[9]{36} \le ζ^k_k.$$ We also prove that for any $k \ge 3$ we have $$ζ_k^{k} \le 2.053^{\frac{1}{1.053+1/k}}< 1.98,$$ improving the upper bound of Nagy.

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。

↑