On the spectrum of an extremal graph with four eigenvalues

被引：5
|
作者：
Fiol, M. A. [1 ]
Garriga, E. [1 ]
机构：
[1] Univ Politecn Catalunya, Dept Matemat Aplicada 4, ES-08034 Barcelona, Spain
来源：
DISCRETE MATHEMATICS | 2006年 / 306卷 / 18期
关键词：
graph; adjacency matrix; four eigenvalues; diameter three;
D O I：
10.1016/j.disc.2006.05.010
中图分类号：
O1 [数学];
学科分类号：
0701 ; 070101 ;
摘要：
In this note we study some properties of the spectrum of a connected graph G with four different eigenvalues, and (spectrally maximum) diameter three. When G is regular, this is the case, for instance, when G is a distance-regular graph. (c) 2006 Elsevier B.V. All rights reserved.
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页码：2241 / 2244
页数：4
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