arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2402.03015math.COcs.DM
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关于图中的开分离支配码

On open-separating dominating codes in graphs

Dipayan Chakraborty, Annegret K. Wagler

AI总结:

本文提出开分离支配码(OD-码)新概念,研究其存在性、难解性与极小性,并与开分离全支配码(OTD-码)在图族上比较,最终将问题转化为超图覆盖问题并讨论相关多面体。

摘要:

利用支配集来分离图的顶点,是识别问题这一更大领域中一个研究充分的问题。在这类问题中,目标是选择图$G$的一个合适的支配集$C$,该集合同时具有分离性,即$G$中任意两个不同顶点的邻域与$C$的交集互不相同。这样的支配且分离的集合$C$在文献中常被称为码。根据所使用的支配集和分离集的类型,文献中以各种名称出现了各种问题。在本文中,我们在识别问题的同一领域中引入了一个新问题,其中码被称为开分离支配码,简称OD-码,它是一个支配集,并使用开邻域来分离顶点。本文研究了关于OD-码的存在性、难解性和极小性的基本性质。由于OD-码与文献中另一个被充分研究的码——称为开(邻域)定位支配码(本文中称为开分离全支配码,简称OTD-码)——之间出现了紧密但难以建立的关系,我们在各种图族上比较了这两种码。最后,我们还提供了将寻找图的OD-码问题等价地重新表述为合适超图中的覆盖问题,并讨论了与OD-码相关的多面体,同样与本文语境中已研究的某些图族的OTD-码相关联。

英文摘要:

Using dominating sets to separate vertices of graphs is a well-studied problem in the larger domain of identification problems. In such problems, the objective is to choose a suitable dominating set $C$ of a graph $G$ which is also separating in the sense that the neighbourhoods of any two distinct vertices of $G$ have distinct intersections with $C$. Such a dominating and separating set $C$ of a graph is often referred to as a code in the literature. Depending on the types of dominating and separating sets used, various problems arise under various names in the literature. In this paper, we introduce a new problem in the same realm of identification problems whereby the code, called open-separating dominating code, or OD-code for short, is a dominating set and uses open neighbourhoods for separating vertices. The paper studies the fundamental properties concerning the existence, hardness and minimality of OD-codes. Due to the emergence of a close and yet difficult to establish relation of the OD-code with another well-studied code in the literature called open (neighborhood)-locating dominating code (referred to as the open-separating total-dominating code and abbreviated as OTD-code in this paper), we compare the two codes on various graph families. Finally, we also provide an equivalent reformulation of the problem of finding OD-codes of a graph as a covering problem in a suitable hypergraph and discuss the polyhedra associated with OD-codes, again in relation to OTD-codes of some graph families already studied in this context.

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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