Majorization, degree sequence and Aα-spectral characterization of graphs
Majorization, degree sequence and Aα-spectral characterization of graphs
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图表的主化、度数序列和 Aα 谱特征
DOI:
10.1016/j.disc.2020.112132
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发表时间:
2020-12
影响因子:
0.8
通讯作者:
Jie Xue
中科院分区:
文献类型:
--
作者:
Huiqiu Lin;Liwen Zhang;Jie Xue
Abstract Let π=(d 1, d 2,…, d n) and π′=(d 1′, d 2′,…, d n′) be two non-increasing degree sequences. We say π is majorizated by π′, denoted by π≺ π′, if and only if∑ i= 1 n d i=∑ i= 1 n d i′ and∑ i= 1 j d i≤∑ i= 1 j d i′ for j= 1, 2,…, n− 1. By using majorization, we show that some graphs are determined by their A α-spectra. Firstly, we show that the lollipop graph is determined by its A α-spectrum for 0< α< 1, which generalizes the result of Zhang, Liu, Zhang and Yong’s [The lollipop graph is determined by its Q-spectrum, Discrete Math. 309 (2009) 3364–3369]. Secondly, following the result of Cámara and Haemers’[Spectral characterizations of almost complete graphs, Discrete Appl. Math. 176 (2014) 19–23], we show K n∖ H is determined by its A α-spectrum where H∈{P k, K 1, k, K 2 p+ q∖ p K 2} and 1∕ 2< α< 1, which implies that the friendship graph is determined by its A α-spectrum for 1∕ 2< α< 1.
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影响因子:
1.8
作者:
H. Günthard;H. Primas
通讯作者:
H. Günthard;H. Primas
影响因子:
1.1
作者:
W. Haemers;Xiaogang Liu;Yuanping Zhang
通讯作者:
W. Haemers;Xiaogang Liu;Yuanping Zhang
DOI:
10.37236/2483
发表时间:
2012-12
期刊:
Electron. J. Comb.
影响因子:
--
作者:
Muhuo Liu
通讯作者:
Muhuo Liu
DOI:
10.1016/j.dam.2020.04.011
发表时间:
2020-09
期刊:
Discret. Appl. Math.
影响因子:
--
作者:
Muhuo Liu;H. Shan;Xiaofeng Gu
通讯作者:
Muhuo Liu;H. Shan;Xiaofeng Gu
影响因子:
1.1
作者:
E. V. Dam;W. Haemers
通讯作者:
E. V. Dam;W. Haemers