On recognition of simple classical groups with prime graph independence number $4$ by spectrum

Abstract

Let $L$ be one of the finite simple classical groups $L_8(q)$, $U_8(q)$, $O_{10}^{+}(q)$, $O_{10}^{-}(q)$ or $O_{12}^{+}(q)$, with $q$ odd. We prove that every finite group having the same set of element orders as $L$ is an almost simple group with socle isomorphic to $L$. This completes the study of the recognition-by-spectrum problem for simple classical groups whose prime graph independence number is equal to $4$.