中国科学技术大学学报 ›› 2014, Vol. 44 ›› Issue (3): 176-180.DOI: 10.3969/j.issn.0253-2778.2014.03.002

• 论著 • 上一篇    

具有n-3个悬挂点的树的距离无符号拉普拉斯谱半径

余桂东,龚奇娟,段兰   

  1. 安庆师范学院数学与计算科学学院,安徽安庆 246011
  • 收稿日期:2013-11-26 修回日期:2014-02-18 接受日期:2014-02-18 出版日期:2014-02-18 发布日期:2014-02-18

The distance signless Laplacian spectral radius of trees with n-3 pendent vertices

YU Guidong, GONG Qijuan, DUAN Lan   

  1. School of Mathematics and Computation Sciences, Anqing Normal College, Anqing 246011, China
  • Received:2013-11-26 Revised:2014-02-18 Accepted:2014-02-18 Online:2014-02-18 Published:2014-02-18
  • Contact: YU Guidong
  • About author:YU Guidong (corresponding author), female, born in 1973, PhD. Research field: Graph theory.
  • Supported by:
    Supported by National Natural Science Foundation of China (11071002), NFS of Anhui Province (11040606M14), NSF of Department of Education of Anhui Province (KJ2011A195, KJ2010B136).

摘要: 一个连通图G的距离无符号拉普拉斯谱半径是G的距离无符号拉普拉斯矩阵的谱半径.G的距离无符号拉普拉斯矩阵定义为Q(G)=Tr(G)+D(G),这里Tr(G)是G的顶点传递的对角阵, 且D(G)是G的距离矩阵.研究了所有n阶具有n-3个悬挂点的树的距离无符号拉普拉斯谱半径的极小值,并刻画了一类n阶具有n-3个悬挂点的树的距离无符号拉普拉斯谱半径的极大值与极小值.

关键词: 图, 树, 距离无符号拉普拉斯矩阵, 距离无符号拉普拉斯谱半径

Abstract: The distance signless Laplacian spectral radius of a connected graph G is the spectral radius of the distance signless Laplacian matrix of G, defined as Q(G)=Tr(G)+D(G), where Tr(G) is the diagonal matrix of vertex transmissions of G, and D(G) is the distance matrix of G. It was investigated that the minimum of the distance signless Laplacian spectral radius among all trees with n-3 pendent vertices, and characterized that the unique tree whose distance signless Laplacian spectral radius is the maximum (minimum) among some trees with n-3 pendent vertices.

Key words: graph, tree, distance signless Laplacian matrix, distance signless Laplacian spectral radius

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