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arXiv 1807.04372math.CO
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图与群的固定数

Fixing Numbers of Graphs and Groups

Courtney R. Gibbons, Joshua D. Laison

AI总结:

本文定义了图与群的固定数及固定集,将其视为图区分数的变体,并刻画了有限阿贝尔群的固定集,同时研究了对称群的固定集。

摘要:

图$G$的固定数是顶点集$S$的最小基数,使得仅有$G$的平凡自同构固定$S$中的每个顶点。群$Γ$的固定集是所有以$Γ$为自同构群的有限图的固定数构成的集合。多位作者研究了图的区分数,即为标记$G$使其自同构群变得平凡所需的最少标签数。固定数可视为区分数的一种变体,其中每个标签仅能使用一次,且并非每个顶点都需要被标记。我们刻画了有限阿贝尔群的固定集,并研究了对称群的固定集。

英文摘要:

The fixing number of a graph $G$ is the smallest cardinality of a set of vertices $S$ such that only the trivial automorphism of $G$ fixes every vertex in $S$. The fixing set of a group $Γ$ is the set of all fixing numbers of finite graphs with automorphism group $Γ$. Several authors have studied the distinguishing number of a graph, the smallest number of labels needed to label $G$ so that the automorphism group of the labeled graph is trivial. The fixing number can be thought of as a variation of the distinguishing number in which every label may be used only once, and not every vertex need be labeled. We characterize the fixing sets of finite abelian groups, and investigate the fixing sets of symmetric groups.

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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