2019•DOAJ (DOAJ: Directory of Open Access Journals)Open access
Finite groups with the same conjugacy class sizes as a finite simple group
Neda Ahanjideh
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Abstract
For a finite group $H$, let $cs(H)$ denote the set of non-trivial conjugacy class sizes of $H$ and $OC(H)$ be the set of the order components of $H$. In this paper, we show that if $S$ is a finite simple group with the disconnected prime graph and $G$ is a finite group such that $cs(S)=cs(G)$, then $|S|=|G/Z(G)|$ and $OC(S)=OC(G/Z(G))$. In particular, we show that for some finite simple group $S$, $G cong S times Z(G)$.