The characteristic polynomial of a generalized join graph

The characteristic polynomial of a generalized join graph
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广义连接图的特征多项式

DOI:
10.1016/j.amc.2018.12.013
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发表时间:
2019-05
影响因子:
4
通讯作者:
Chen Haiyan
Chen Haiyan
中科院分区:
数学2区
文献类型:
--
作者:
Chen Yu;Chen Haiyan

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对于具有邻接矩阵A(G)和度对角矩阵D(G)的图G,Cvetković等人引入了二元多项式G(x,t)= d e t(x I-(A(G)-t D(G),其中I是单位矩阵。多项式<$G(x,t)不仅推广了与G有关的一些著名矩阵的特征多项式,如邻接矩阵、拉普拉斯矩阵,而且具有与Bartholdi zeta函数等价的优美的组合解释。设G= H [G1,G2,.,Gk]是由图H确定的G1,G2,.,Gk的广义联图.本文首先给出了图G(x,t)的一个分解公式。该分解公式为构造无穷多对非正则互余谱图提供了一种新的方法。作为应用,给出了几类特殊图的图G(x,t)的显式表达式.
For a graph G with adjacency matrix A (G) and degree-diagonal matrix D (G), Cvetković et al introduced a bivariate polynomial ϕ G (x, t)= d e t (x I−(A (G)− t D (G))), where I is the identity matrix. The polynomial ϕ G (x, t) not only generalizes the characteristic polynomials of some well-known matrices related to G, such as the adjacency, the Laplacian matrices, but also has an elegant combinatorial interpretation as being equivalent to the Bartholdi zeta function. Let G= H [G 1, G 2,…, G k] be the generalized join graph of G 1, G 2,…, G k determined by graph H. In this paper, we first give a decomposition formula for ϕ G (x, t). The decomposition formula provides us a new method to construct infinitely many pairs of non-regular ϕ-cospectral graphs. Then, as applications, explicit expressions for ϕ G (x, t) of some special kinds of graphs are given.
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