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arXiv 2103.10172math.COcs.DM
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具有唯一Grundy支配集的图

Graphs with unique Grundy dominating sets

Boštjan Brešar, Tanja Dravec

AI总结:

研究图$G$中Grundy支配集的唯一性条件,在自同构映射下刻画四种变体中具有唯一Grundy支配集的图与森林,并为森林类提出高效识别算法。

摘要:

给定图$G$,考虑在$G$中构建支配集$D$的过程:每次向$D$中添加一个顶点,且每当顶点$x$被添加到$D$时,存在顶点$y\in N_G[x]$仅在$x$被添加后才受支配。按此方式获得的集合$D$的最大基数称为$G$的Grundy支配数,$D$称为Grundy支配集。虽然连通图$G$的Grundy支配集通常不唯一(除非$G$是平凡图),但我们考虑一种自然的较弱唯一性条件,即对于图$G$中的任意两个Grundy支配集,存在自同构将其中一个映射到另一个。我们研究了Grundy支配几种概念的两种唯一性版本,这些概念出现在支配博弈背景下,且与零强迫密切相关。对于Grundy支配的四种变体,我们分别刻画了仅具有唯一给定类型Grundy支配集的图,并刻画了满足较弱(基于同构的)唯一性条件的森林。后者刻画导出了识别相应森林类的高效算法。

英文摘要:

Given a graph $G$ consider a procedure of building a dominating set $D$ in $G$ by adding vertices to $D$ one at a time in such a way that whenever vertex $x$ is added to $D$ there exists a vertex $y\in N_G[x]$ that becomes dominated only after $x$ is added to $D$. The maximum cardinality of a set $D$ obtained in the described way is called the Grundy domination number of $G$ and $D$ a Grundy dominating set. While a Grundy dominating set of a connected graph $G$ is not unique unless $G$ is the trivial graph, we consider a natural weaker uniqueness condition, notably that for every two Grundy dominating sets in a graph $G$ there is an automorphism that maps one to the other. We investigate both versions of uniqueness for several concepts of Grundy domination, which appeared in the context of domination games and are also closely related to zero forcing. For each of the four variations of Grundy domination we characterize the graphs that have only one Grundy dominating set of the given type, and characterize those forests that enjoy the weaker (isomorphism based) condition of uniqueness. The latter characterizations lead to efficient algorithms for recognizing the corresponding classes of forests.

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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