第二大根小于1的简单图

徐光辉;邵嘉裕

系统科学与数学 ›› 2006, Vol. 26 ›› Issue (1) : 121-128.

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系统科学与数学 ›› 2006, Vol. 26 ›› Issue (1) : 121-128. DOI: 10.12341/jssms09235
论文

第二大根小于1的简单图

    徐光辉(1)(2),邵嘉裕(2)
作者信息 +

On Graphs Whose Second Largest Eigenvalue Is Less Than 1

    Xu Guanghui(1)(2),Shao Jiayu(2)
Author information +
文章历史 +

摘要

Gn阶简单图,λ2(G)G的第二大特征根.
给出了所有使λ2(G)<1的偶图,以及使
λ2(G)<1、围长不小于4的非偶图.

Abstract

Let G be a simple graph with n vertices, and let
λ1(G)λ2(G)λn(G) be the eigenvalues of the
adjacency matrix of G. We call λ2(G) the second largest eigenvalue of G.
In this paper, all the non-bipartite graphs with girth g4 and all the
bipartite graphs
whose second largest eigenvalue is less than 1 have been determined.

关键词

/ 特征根 / 偶图 / 围长.

Key words

Graph / eigenvalue / bipartite graph / girth.

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徐光辉 , 邵嘉裕. 第二大根小于1的简单图. 系统科学与数学, 2006, 26(1): 121-128. https://doi.org/10.12341/jssms09235
Xu Guanghui , Shao Jiayu. On Graphs Whose Second Largest Eigenvalue Is Less Than 1. Journal of Systems Science and Mathematical Sciences, 2006, 26(1): 121-128 https://doi.org/10.12341/jssms09235
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