Sylow p-子群的非平凡子群与有限群的p-超可解性

设E是有限群G的正规子群使得G/E为p-超可解群,P是E的正规的Sylowp-子群,其中p为一奇素数,如果P存在一个子群D满足以下性质：1〈︱D︱〈︱P︱,对于任意的H≤P,︱H︱=︱D︱,H在G中正规,则G为p-超可解群.     

Sylow子群的正规化子和子群的弱s-置换性

利用Sylow子群的极大子群在其所在的Sylow子群正规化子中的弱s-置换性得到有限群的p-幂零性的一些刻画.证明了:设G为有限群,p为|G|的素因子,且(|G|,p-1)=1,P∈Sylp(G);若P的每个极大子群在NG(P)中弱s-置换且P′在G中s-置换,则G为p-幂零群.同时得到几个有关群系的结论.     

超可解群的两个判别准则

群G的子群H称为在G中弱s可补充的,如果G有子群K,使得HK=G且H∩K≤H;c．这里H;c是包含在H中的G的最大s置换子群．利用准素子群的弱s可补充性质,给出了超可解群的两个充分条件．     

准素子群的几乎s正规性对超中心的影响

设H是有限群G的子群,若存在G的正规子群K,使得HK G,且H∩K≤HsG,HsG是G的包含于H的最大s拟正规子群,则称H在G中几乎s正规.本文利用某些准素子群的几乎s正规性来研究有限群的FΦ超中心的构造.     

关于典型群的Sylow子群的阶

给出了典型群的Ｓｙｌｏｗ子群阶的表达式及其与典型群维数之间的关系式．     

Characterization of generalized Chernikov groups among groups with involutions

The class of generalized Chernikov groups is characterized, i.e., the class of periodic locally solvable groups with the primary ascending chain condition. The name of the class is related to the fact that the structure of such groups is close to that of Chernikov groups. Namely, a Chernikov group is defined as a finite extension of a direct product of finitely many quasi-cyclic groups, and a generalized Chernikov group is a layer-finite extension of a direct productA of quasi-cyclicp-groups with finitely many factors for each primep such that each of its elements does not commute elementwise with only finitely many Sylow subgroups ofA. A theorem that characterizes the generalized Chernikov groups in the class of groups with involution is proved. Translated fromMatematicheskie Zametki, Vol. 62, No 4, pp. 577–587, October, 1997. Translated by A. I. Shtern     

Rationality and strong reality for Sylow 2-subgroups of Weyl and alternating groups

It is proved that values of all complex characters for a Sylow 2-subgroup P of any Weyl group are rational, and every element of P is a product of two involutions in P. Similar results hold also for Sylow 2-subgroups of alternating groups.Supported by RFBR grant No. 03-01-00905.Translated from Algebra i Logika, Vol. 44, No. 1, pp. 44–53, January–February, 2005.