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arXiv 1004.5230cs.DMmath.CO
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极图识别码问题

Extremal graphs for the identifying code problem

Florent Foucaud, Eleonora Guerrini, Matjaz Kovse, Reza Naserasr, Aline Parreau, Petru Valicov

摘要:

图G的一个标识码是一个支配集C,使得G的每个顶点x与所有其他顶点的区别在于C中距离x至多为1的顶点的集合。找到一个尽可能小的识别码的问题被证明是一个具有挑战性的问题。N. Bertrand证明了如果n个顶点上的至少有一条边的图允许一个标识码,则最小标识码的大小至多为n-1。一些最小标识码为n-1的图类已经被知道,并且很少有公式化的图来分类所有这些图。在本文中,反驳这些命题,我们分类所有的有限图,其中所有的顶点,但其中之一是需要形成一个识别码。我们还分类所有的无限图需要在任何识别码的顶点的整个集合。同时给出了图的顶点数和最大度的新的上界。

英文摘要:

An identifying code of a graph G is a dominating set C such that every vertex x of G is distinguished from all other vertices by the set of vertices in C that are at distance at most 1 from x. The problem of finding an identifying code of minimum possible size turned out to be a challenging problem. It was proved by N. Bertrand that if a graph on n vertices with at least one edge admits an identifying code, then a minimum identifying code has size at most n-1. Some classes of graphs whose smallest identifying code is of size n-1 were already known, and few conjectures were formulated to classify all these graphs. In this paper, disproving these conjectures, we classify all finite graphs for which all but one of the vertices are needed to form an identifying code. We also classify all infinite graphs needing the whole set of vertices in any identifying code. New upper bounds in terms of the number of vertices and the maximum degree of a graph are also provided.

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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