On the Main Signless Laplacian Eigenvalues of a Graph

On the Main Signless Laplacian Eigenvalues of a Graph
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DOI:
10.13001/1081-3810.1659
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发表时间:
2012-08
期刊:
arXiv: Combinatorics
影响因子:
--
通讯作者:
H. Deng;He Huang
H. Deng;He Huang
中科院分区:
其他
文献类型:
--
作者:
H. Deng;He Huang

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一个图$G$的无符号拉普拉斯特征值,如果它有一个特征向量,其项的和不等于零,则称为主无符号拉普拉斯特征值。本文首先给出了具有一个主无符号特征值的图和具有两个主无符号特征值的图的充分必要条件,然后分别刻画了具有两个主无符号特征值的树图和单环图。
A signless Laplacian eigenvalue of a graph $G$ is called a main signless Laplacian eigenvalue if it has an eigenvector the sum of whose entries is not equal to zero. In this paper, we first give the necessary and sufficient conditions for a graph with one main signless Laplacian eigenvalue or two main signless Laplacian eigenvalues, and then characterize the trees and unicyclic graphs with exactly two main signless Laplacian eigenvalues, respectively.