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:
影响因子:
--
通讯作者:
H. Deng;He Huang
中科院分区:
文献类型:
--
作者:
H. Deng;He Huang
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.