Abstract
<abstract><p>In this paper, we studied the influence of centralizers on the structure of groups, and demonstrated that Janko simple groups can be uniquely determined by two crucial quantitative properties: its even-order components of the group and the set $ \pi_{p_m}(G) $. Here, $ G $ represents a finite group, $ \pi(G) $ is the set of prime factors of the order of $ G $, $ p_m $ is the largest element in $ \pi(G) $, and $ \pi_{p_m}(G) = \{|C_G(x)| \large| \; x\in G $ and $ |x| = p_m \}$ denotes the set of orders of centralizers of $ p_m $-order elements in $ G $.</p></abstract>
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