Inertia indices of a complex unit gain graph in terms of matching number

Inertia indices of a complex unit gain graph in terms of matching number
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复杂单位增益图的惯性指数(以匹配数表示)

DOI:
10.1080/03081087.2022.2064968
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发表时间:
2021-08
影响因子:
1.1
通讯作者:
Yong Lu
Yong Lu
中科院分区:
数学3区
文献类型:
--
作者:
Qi Wu;Yong Lu

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复单位增益图是由一个简单图G(单位复数集合的底层图)和一个增益函数组成的三重图(简称为三重图)。设的邻接矩阵。本文证明了其中,、和分别是G的正特征值个数、负特征值个数、匹配数和圈数。进一步,我们分别刻画了达到上界和下界的图。
A complex unit gain graph is a triple (or for short) consisting of a simple graph G, as the underlying graph of , the set of unit complex numbers and a gain function such that . Let be the adjacency matrix of . In this paper, we prove that where , , and are the number of positive eigenvalues of , the number of negative eigenvalues of , the matching number and the cyclomatic number of G, respectively. Furthermore, we characterize the graphs which attain the upper bounds and the lower bounds, respectively.
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