On the Estrada index of cactus graphs
On the Estrada index of cactus graphs
复制标题
关于仙人掌图的 Estrada 指数
DOI:
10.1016/j.dam.2015.09.026
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发表时间:
2016-04
影响因子:
1.1
通讯作者:
赵海兴
中科院分区:
文献类型:
--
作者:
李发旭;赵海兴
The Estrada index of a graph G, introduced by Estrada in 2000, is defined as E E (G)=∑ i= 1 n e λ i, where λ 1, λ 2,…, λ n are the eigenvalues of a graph G. A cactus graph is a connected graph in which any two simple cycles have at most one vertex in common. In this paper, we investigate cactus graphs in which every block is a triangle. The upper and lower bounds for Estrada index of these cactus graphs are obtained, and all the graphs attaining upper and lower bounds are characterized, respectively. The lower bound for Estrada index of these cactus graphs with given maximum degree is also obtained, and graph attaining lower bound is characterized.
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DOI:
10.1088/1751-8113/44/7/075003
发表时间:
2011-02
期刊:
Journal of Physics A: Mathematical and Theoretical
影响因子:
--
作者:
Y. Shang
通讯作者:
Y. Shang
影响因子:
0.7
作者:
Y. Shang
通讯作者:
Y. Shang
影响因子:
8.9
作者:
D. Cvetkovic;I. Gutman
通讯作者:
D. Cvetkovic;I. Gutman
DOI:
10.2298/pim0897001g
发表时间:
2008
期刊:
Publications De L'institut Mathematique
影响因子:
--
作者:
I. Gutman
通讯作者:
I. Gutman
影响因子:
2.4
作者:
Estrada, Ernesto
通讯作者:
Estrada, Ernesto