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arXiv 2212.04570math.CO
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图的控制图,中位图,部分立方体及极小控制集的补为极小控制集的图

On dominating graph of graphs, median graphs and partial cubes, and graphs in which complement of every minimal dominating set is minimal dominating

Alireza Mofidi

摘要:

图G的控制图是这样的图,其顶点对应于图G的控制集,并且当两个顶点对应的控制集恰好有一个顶点不同时,两个顶点相邻。研究控制图的性质已成为控制论中一个日益有趣的课题。另一方面,中值图和部分立方体是图论中的两个基本图类。在本文中,我们将控制论与中位图和部分立方体理论联系起来。作为主要结果,我们证明了以下条件对每个没有孤立点的图$G \not \simeq C_4$都是等价的,特别是简单的第三个条件完全刻画了前两个条件,其中涉及到控制图、中值图和极小控制集的补的三个概念:- G的控制图是一个中值图,-G的每一个极小控制集的补是一个极小控制集,-G的每一个顶点都是1度的或与1度的顶点相邻。作为另一个结果,我们证明了每个图的控制图是一个部分立方体,并给出了一些例子来说明不是所有的部分立方体或中位数图同构于图的控制图。上述结果是本文的另一个亮点,为中值图和部分立方体的例子提供了新的无限来源。

英文摘要:

The dominating graph of a graph G is a graph whose vertices correspond to the dominating sets of G and two vertices are adjacent whenever their corresponding dominating sets differ in exactly one vertex. Studying properties of dominating graph has become an increasingly interesting subject in domination theory. On the other hand, median graphs and partial cubes are two fundamental graph classes in graph theory. In this paper, we make some new connections between domination theory and the theory of median graphs and partial cubes. As the main result, we show that the following conditions are equivalent for every graph $G \not \simeq C_4$ with no isolated vertex, and in particular, that the simple third condition completely characterizes first two ones in which three concepts of dominating graphs, median graphs and complement of minimal dominating sets get related: - The dominating graph of G is a median graph, - The complement of every minimal dominating set of G is a minimal dominating set, - Every vertex of G is either of degree 1 or adjacent to a vertex of degree 1. As another result, we prove that the dominating graph of every graph is a partial cube and also give some examples to show that not all partial cubes or median graphs are isomorphic to the dominating graph of a graph. The above-mentioned results, as another highlight of the paper, provide novel infinite sources of examples of median graphs and partial cubes.

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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