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ON FINITE GROUPS ISOSPECTRAL TO SIMPLE SYMPLECTIC AND ORTHOGONAL GROUPS

机译:关于仅等分于辛和正交群的有限群

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摘要

The spectrum of a finite group is the set of its element orders. Two groups are said to be isospectral if their spectra coincide. We deal with the class of finite groups isospectral to simple and orthogonal groups over a field of an arbitrary positive characteristic p. It is known that a group of this class has a unique nonabelian composition factor. We prove that this factor cannot be isomorphic to an alternating or sporadic group. We also consider the case where this factor is isomorphic to a group of Lie type over a field of the same characteristic p.
机译:有限群的频谱是其元素阶数的集合。如果两组光谱一致,则称它们为等光谱。我们处理在任意正特性p的场上等光谱为简单和正交组的有限组的类别。已知此类的一组具有唯一的非阿贝尔组成因子。我们证明了这个因素对于一个交替的或零星的群体不可能是同构的。我们还考虑以下情况:在同一特征p的场上,该因子与一组Lie类型同构。

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