Some results on the signless Laplacians of graphs

被引：11
|
作者：
Wang, Jianfeng [2 ,3 ]
Huang, Qiongxiang [3 ]
An, Xinhui [3 ]
Belardo, Francesco [1 ]
机构：
[1] Univ Messina, Dept Math, I-98166 Messina, Italy
[2] Qinghai Normal Univ, Dept Math, Xining 810008, Qinghai, Peoples R China
[3] Xinjiang Univ, Coll Math & Syst Sci, Urumqi 830046, Peoples R China
来源：
APPLIED MATHEMATICS LETTERS | 2010年 / 23卷 / 09期
关键词：
Signless Laplacian; Spectrum; Eigenvalues; Coefficients; Limit point; LIMIT POINTS;
D O I：
10.1016/j.aml.2010.04.034
中图分类号：
O29 [应用数学];
学科分类号：
070104 ;
摘要：
In this paper we give two results concerning the signless Laplacian spectra of simple graphs. Firstly, we give a combinatorial expression for the fourth coefficient of the (signless Laplacian) characteristic polynomial of a graph. Secondly, we consider limit points for the (signless Laplacian) eigenvalues and we prove that each non-negative real number is a limit point for (signless Laplacian) eigenvalue of graphs. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1045 / 1049
页数：5
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