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2-Recognizability by prime graph of PSL (2, p 2)

机译:2-通过PSL的质数图可识别性(2,p 2)

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摘要

Let G be a finite group and let Γ(G) be the prime graph of G. Assume p prime. We determine the finite groups G such that Γ(G) = Γ(PSL(2, p 2)) and prove that if p ≠ 2, 3, 7 is a prime then k(Γ(PSL(2, p 2))) = 2. We infer that if G is a finite group satisfying |G| = |PSL(2, p 2)| and Γ(G) = Γ(PSL(2, p 2)) then G ? PSL(2, p 2). This enables us to give new proofs for some theorems; e.g., a conjecture of W. Shi and J. Bi. Some applications are also considered of this result to the problem of recognition of finite groups by element orders.
机译:令G为有限群,令Γ(G)为G的素数图。假定p素数。我们确定有限群G使得Γ(G)=Γ(PSL(2,p 2))并证明如果p≠2,3,7是质数,则k(Γ(PSL(2,p 2)) )=2。我们推断,如果G是满足| G |的有限群, = | PSL(2,p 2)|并且Γ(G)=Γ(PSL(2,p 2))然后G? PSL(2,p 2)。这使我们能够为某些定理提供新的证明。例如,W。Shi和J. Bi。的猜想。一些结果也被认为可以应用到通过单元阶识别有限群的问题上。

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