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
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发表时间:
2018-11
期刊:
影响因子:
--
通讯作者:
Greg Markowsky
中科院分区:
文献类型:
--
作者:
Zhi Qiao;Jack Koolen;Greg Markowsky
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.
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