一类2q^2p^n阶群的构造

利用有限群的性质,运用群扩张理论和数论的有关知识,证明了Sylow p-子群为循环群时2q^2p^n阶群的构造,其中q＜p为奇素数.     

含有极大子群为单群的非单有限群的结构

本文研究并解决了含有一极大子群为单群的非单有限群的结构,主要结论是:设G为有限群,H为G的一个极大子群,则1.H为p(素数)阶群时,G为p~2阶群,或pq阶阿贝尔群,或pq~β阶极小非幂零群.其中p≠q且均为素数,β为q关于模p的指数.2.H为非阿贝尔单群.但G非单时,G必为下列情形之一:1)H×K;H为非阿贝尔单群,K为素数阶群.2)H_1×H_2;H_1、H_2为互相同构的非阿贝尔单群.3)H≤G;G/H的阶为素数,H为非阿贝尔单群且在G内无正规补子群.4)G=HN;H∩N=1,H为非阿贝尔单群,N为非单的特征单群,且H依共轭不可约地作用于N上.此外,对有限群G中的单极大子群之间的关系,本文也进行了若干讨论.     

关于有限群的s-半正规子群I

分类了含有非平凡的s-半正规子群的有限单群：G是含有非平凡s-半正规子群H的单群当且仅当G是下4型群之一：(1)G=Ap，H≌Ap-1，p为素数；(2)G=PSL(n，g)且H是一条直线或一个超平面的稳定子群，|G：H|=(q^n-1)／(q-1)=p^a，其中p和n均为素数；(3)G=PSL(2，11)，H≌A5；(4)G=M22，H≌M21或G=M11，H≌M10，还得到了一个Schur-Zassenhaus型的定理：假设有限群G含有一个s-半正规的Hallπ′-子群，则：(1)G∈Cπ；(2)进而如果G没有截段同构于PSL(2，q)，其中q是一个Mersenne素数，则G∈Dπ。     

非正规子群都是q群的有限群

得到非正规子群都是q群的完全分类,即证明了如下结论：设q是一个素数,有限群C不是Dedekind群,则G的非正规子群都是q群的充要条件是G为非交换q群且不同构于Q8×E,其中Q8是8阶四元数群,E为初等阿贝尔2-群,或G=PQ,其中P为G的P阶正规子群,Q为G的非正规q群,Q为Dedekind群且p=1（mod q）．     

F~*-子群与有限群的超可解性

设F是一个群类,称子群H为G的F*-子群,如果存在G的正规子群B使得H B—G,B/(B∩HG)∈F且对满足(q,H)=1的任意素数q,B都包含G的一个Sy low q-子群。本文利用素数幂阶F*-子群,给出有限群G为超可解的若干充分条件。     

幂零完全可约线性群的阶的上界

研究了幂零完全可约线性群的阶的上界,并且由此改进了Burnsidepaqb补充定理.证明了:定理1　令V≠0是含qm个元素的有限域上的n维向量空间,q为素数.设G为完全线性群GL(V)的幂零完全可约子群,则有(Ⅰ)|G|≤14|V|β,除非(i)　|V|≤8,|G|=|V|-1;(ii)　|V|=32l(l≥1)且|G|=12|V|β=25·2l-1-1,此时GL(V)=GL(2l,3),G∈Syl2(GL(V)),β=log32/log9.(Ⅱ)若G是p群且(p,q)(2,F)∪(M,2)∪(2,7),|G|≠12(|V|-1),则有|G|≤38|V|,特别地若还有|V|≠24,q,q3,则|G|≤14|V|.其中F,M分别表示Fermat和Mersenne素数集.     

同阶子群个数之集为{1,3,p+1}的有限群

设G是有限群，n(G)表示同阶子群个数组成的集合.本文刻画了n(G)={1, 3,p+1}时有限群G的结构，其中p为奇素数.     

有限域上有限伪反射群的相对不变式的Poincaré级数（英文）

设F q(q=pm,m≥1)为特征为p的有限域,V=Fn q是F q上的n维向量空间,G是作用在V上的有限伪反射群.设χ:G→F*q是G的一维表示,主要证明了χ(σ)=(detσ)α,0≤α≤r-1,其中,σ∈G,阶为r,r|q-1和有限域上的Molien公式,并且利用Molien公式,计算出了有限域上有限伪反射群的相对不变式的Poincaré级数.     

恰有4个非正规子群的有限群

利用非正规子群的共轭类类数为1,2的有限幂零群的结构,运用局部分析的方法,对恰有4个非正规子群的有限群进行了分类,为恰有2p个非正规子群的有限群的研究开拓了思路.主要结果为若有限群G恰有4个非正规子群,则G幂零且同构于以下群之一:1)P2×Zq,其中P2=x,y|x2n=y2=1,xy=x1+2n-1,n≥3且q为奇素数,Zq是q阶循环群;2)[Z4]Z4,其中Z4是4阶循环群;3)Q16;4)D8;5)M(2n,4)=x,y y2n=x4=1,yx=y1+2n-1,n≥3.     

有限超可解群的一些充要条件II

主要证明了如下的结果:假设M是有限群G的任意极大子群,则下列命题是等价的:(1)G是超可解群;(2)M补于G的某个素数阶主因子;(3)有H G使M∩H为H的正规的极大子群;(4)M/MG为幂指数整除p-1的Abel群且｜G∶M｜为素数p的幂;(在下面的(5)～(8)中假设G之所有含于F(G)和Φ(G)之间的主因子在G中的中心化子之交是可解群.)(5)Φ(G)=H0相似文献   

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