arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2209.01795math.CO
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超支配:图类、积与Enumeration

Super Domination: Graph Classes, Products and Enumeration

Nima Ghanbari, Gerold Jäger, Tuomo Lehtilä

摘要:

支配集问题是组合优化中最著名的问题之一。其定义如下。对于给定的简单图$G=(V,E)$,$G$的控制集是一个子集$S\subseteq V$,使得$ V \setminus S$中的每个顶点至少与$S$中的一个顶点相邻.此外,DSP的问题是找到一个最小尺寸的控制集和相应的最小尺寸,PDMATHAMN的控制数。在这篇文章中,我们研究了DSP的一个变体,即超支配集问题(SDSP),它在过去几年中引起了人们的广泛关注。一个控制集$S$称为$G$的超控制集,如果对每个顶点$u\in \overline{S}=V \setminus S$,存在一个$v\in S$使得$N(v)\cap \overline{S}=\{u\}$ .类似地,SDSP是寻找一个最小尺寸的超控制集,以及相应的最小尺寸,$G$的超控制数。DSP和SDSP的决策变体都被证明是$\mathcal{NP}$ -硬的。在本文中,我们提出了紧界的超控制数的邻域电晕产品,PDMATHAMV-胶合,和Hajós和两个图。此外,我们提出了无限的家庭达到我们的界限图。最后,我们给出了某些图类的最小超控制集的确切个数。特别地,圈的超支配集的数量具有相当令人惊讶的性质,因为它在基于$n\mod4$的集合$\{4,n,2n,\frac{5n^2-10n}{8}\}$的值之间变化。

英文摘要:

The dominating set problem (DSP) is one of the most famous problems in combinatorial optimization. It is defined as follows. For a given simple graph $G=(V,E)$, a dominating set of $G$ is a subset $S\subseteq V$ such that every vertex in $ V \setminus S$ is adjacent to at least one vertex in $S$. Furthermore, the DSP is the problem of finding a minimum-size dominating set and the corresponding minimum size, the domination number of $G$. In this, work we investigate a variant of the DSP, the super dominating set problem (SDSP), which has attracted much attention during the last years. A dominating set $S$ is called a super dominating set of $G$, if for every vertex $u\in \overline{S}=V \setminus S$, there exists a $v\in S$ such that $N(v)\cap \overline{S}=\{u\}$. Analogously, the SDSP is to find a minimum-size super dominating set, and the corresponding minimum size, the super domination number of $G$. The decision variants of both the DSP and the SDSP have shown to be $\mathcal{NP}$-hard. In this paper, we present tight bounds for the super domination number of the neighbourhood corona product, $r$-gluing, and the Hajós sum of two graphs. Additionally, we present infinite families of graphs attaining our bounds. Finally, we give the exact number of minimum size super dominating sets for some graph classes. In particular, the number of super dominating sets for cycles has quite surprising properties as it varies between values of the set $\{4,n,2n,\frac{5n^2-10n}{8}\}$ based on $n\mod4$.

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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