Ramanujan Cayley graphs on sporadic groups
نویسندگان
1 Department of Mathematics, Faculty of Mathematical Sciences and Statistics, Malayer University, Malayer, 65719-95863, I. R. Iran
doi
10.22061/jdma.2023.10294.1062چکیده
Let $\Gamma$ be a $k-$regular graph with the second maximum eigenvalue $\lambda$. Then $\Gamma$ is said o be Ramanujan graph if $\lambda\leq 2\sqrt{k-1}$. Let $G$ be a finite group and $\Gamma=Cay(G,S)$ be a Cayley graph related to $G$. The aim of this paper is to investigate the Ramanujan Cayley graphs of sporadic groups.
