On the Cheeger constant for distance-regular graphs

On the Cheeger constant for distance-regular graphs
复制标题

关于距离正则图的 Cheeger 常数

DOI:
10.1016/j.jcta.2020.105227
复制
发表时间:
2018-11
期刊:
Journal of Combinatorial Theory, Series A
影响因子:
--
通讯作者:
Greg Markowsky
Greg Markowsky
中科院分区:
其他
文献类型:
--
作者:
Zhi Qiao;Jack Koolen;Greg Markowsky

文献摘要

参考文献

相似文献

图的切格常数是子图的大小与其边界的大小之间可能的最小比率。众所周知,这个常数必须至少是λ1 2,其中λ1是拉普拉斯矩阵的最小正特征值。本文的主题是作者的一个猜想,即对于距离正则图,切格常数至多为λ1。特别地,我们证明了已知的无限族距离正则图、直径为2的距离正则图(强正则图)、几类直径为3的距离正则图以及大多数小度距离正则图的猜想。
The Cheeger constant of a graph is the smallest possible ratio between the size of a subgraph and the size of its boundary. It is well known that this constant must be at least λ 1 2, where λ 1 is the smallest positive eigenvalue of the Laplacian matrix. The subject of this paper is a conjecture of the authors that for distance-regular graphs the Cheeger constant is at most λ 1. In particular, we prove the conjecture for the known infinite families of distance-regular graphs, distance-regular graphs of diameter 2 (the strongly regular graphs), several classes of distance-regular graphs with diameter 3, and most distance-regular graphs with small valency.
DOI: 10.1007/978-1-4613-0163-9
发表时间: 2001-04
期刊: --
影响因子: --
作者:
C. D. Godsil;G. Royle
通讯作者: C. D. Godsil;G. Royle
DOI: 10.1016/s0097-3165(03)00006-2
发表时间: 2003-05
期刊: J. Comb. Theory A
影响因子: --
作者:
A. Brouwer;C. Godsil;J. Koolen;W. Martin
通讯作者: A. Brouwer;C. Godsil;J. Koolen;W. Martin
DOI: 10.1016/j.ejc.2010.05.012
发表时间: 2009-02
期刊: Eur. J. Comb.
影响因子: --
作者:
J. Koolen;Jongyook Park
通讯作者: J. Koolen;Jongyook Park
DOI: 10.1016/j.disc.2013.06.012
发表时间: 2013-10
期刊: Discret. Math.
影响因子: --
作者:
G. C. Kim;Yoonjin Lee
通讯作者: G. C. Kim;Yoonjin Lee
DOI: 10.1007/3-540-48863-4_3
发表时间: 2007
期刊: --
影响因子: --
作者:
A. Hora;N. Obata
通讯作者: A. Hora;N. Obata