Graphs determined by their generalized characteristic polynomials

Graphs determined by their generalized characteristic polynomials
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由其广义特征多项式确定的图

DOI:
10.1016/j.laa.2010.11.024
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发表时间:
2011-03
影响因子:
1.1
通讯作者:
Xu, Zongben
Xu, Zongben
中科院分区:
数学3区
文献类型:
--
作者:
Wang, Wei;Li, Feng;Lu, Hongliang;Xu, Zongben

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对于给定的具有(0,1)-邻接矩阵 AG 的图 G,G 的广义特征多项式定义为 ψG=ψG(λ,t)=det(λI-(AG-tDG)),其中 I 是 G 的单位矩阵,DG 是 G 的对角度矩阵。本文主要关注用给定图 G 的广义特征多项式 ψG 来表征该图 G 的问题。我们证明了具有相同广义特征多项式的图具有相同的度数序列,在此基础上,提出了一种统一的方法来证明某些图族可以用 ψG 来表征。我们还提供了一种通过使用 GM 切换来构造具有相同广义特征多项式的图的方法。
For a given graph G with (0,1)-adjacency matrix AG, the generalized characteristic polynomial of G is defined to be ϕG=ϕG(λ,t)=det(λI-(AG-tDG)), where I is the identity matrix and DGis the diagonal degree matrix of G. In this paper, we are mainly concerned with the problem of characterizing a given graph G by its generalized characteristic polynomial ϕG. We show that graphs with the same generalized characteristic polynomials have the same degree sequence, based on which, a unified approach is proposed to show that some families of graphs are characterized by ϕG. We also provide a method for constructing graphs with the same generalized characteristic polynomial, by using GM-switching.
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