共查询到19条相似文献,搜索用时 46 毫秒
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众所周知,有限群的两个幂零子群的积不一定是幂零的.本文研究了Engel条件对两个幂零子群的影响,得到两个幂零子群的积为幂零群的几个充分条件。 相似文献
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超可解群的若干充分条件 总被引:12,自引:1,他引:11
关于有限超可解的研究已有不少结果,本文在苏向盈研究有限群的半正规子群的基础上又得到了一系列新的结果(文中定理2—9),本文还对[1]中定理6的证明进行了改进并得到了重要推论,改进的方法在本文得到了充分应用.文中所说群均为有限群,使用的符号是规范的. 相似文献
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有限群为超可解群的充要条件 总被引:1,自引:0,他引:1
用置换条件刻画有限可解群的超可解性已有大量结果,本文的目的是给出另外一些有限可解群为超可解的充要条件。其主要结果是: 1.设G是满足置换条件的有限可解群,则G是超可解群当且仅当如下条件之一成立。 1)G的2-Sylow子群G_2的换位子群G_2′G. 2)G有正规2-补。 2.设G是有限可解群,则G超可解当且仅当G和G′均满足置换条件. 相似文献
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Throughoutthispaper,Gisafinitegroup ,pisaprimeinπ(G) ,andM <·GdenotesthatMisamaximalsubgroupofG .A/BiscalledasectionofGifB A≤G .Therestofnotationsisstandardandtakenmainlyfrom [1 ]and [2 ] . In [3] ,Weilandtprovedthewell knowntheorem :Gissolvableifitcontainstwonilpote… 相似文献
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Algebra and Logic - A subgroup A is seminormal in a finite group G if there exists a subgroup B such that G = AB and AX is a subgroup for each subgroup X from B. We study a group G = G1G2 . . .Gn... 相似文献
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Let X be a nonempty subset of a group G.A subgroup H of G is said to be X-s-permutable in G if there exists an element x ∈ X such that HPx = PxH for every Sylow subgroup P of G.In this paper,some new results are given under the assumption that some suited subgroups of G are X-s-permutable in G. 相似文献
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Chen Zhongmu 《数学年刊B辑(英文版)》1982,3(5):561-566
这篇短文的第一部分给出Huppert定理:“每极大子群有质数指数的有限群为超可解”的一个不用表示轮及Gaschutz定理的证明。该证明得自
定理1 若有限群G有p^\alpha阶极小正规子群N使G/N为超可解,则或者1)G有极大子群M使G=MN,M\cap N=E,或者2)G有质数阶正规子群。
在可解时Huppert定理推广为:
定理2 设G为有限可解群。于是G为超可解当且仅当每极大子群在G内的指数不含平方因子。
单群A_5说明本定理的假设“G可解”是必要的。
本文第二部分是Mclain定理的推广:
定理3 设h=|H|的最小质因子为p_h,最大质因子为q_h,若有限群G的每子群H对其阶h恒存在指数为p_h及q_h的子群,则G为超可解。
更广泛的结论为:
定理4 有限群G为超可解当且仅当存在G的两个子群链
$G=G_0>G_1>G_2>\cdots >G_s>E$
$G=H_0>H_1>H_2>\cdots >H_s>E$
使指数列[G_0:G_1],[G_1:G_2],\cdots,[G_s:E]为从小到大的质数,而[H_0:H_1],[H_1:H_2],\cdots,[H_s:E]为从大到小的质数。 相似文献
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Let P be a subgroup of a Sylow subgroup of a finite group G. If P is a Sylow subgroup of some normal subgroup of G then P is called normally embedded in G. We establish tests for a finite group G to be p-supersoluble provided that every maximal subgroup of a Sylow p-subgroup of X is normally embedded in G. We study the cases when X is a normal subgroup of G, X = Op',p(H), and X = F*(H) where H is a normal subgroup of G. 相似文献
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We study finite groups with generalized normality condition for subgroups of prime order. 相似文献
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Mathematical Notes - 相似文献
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Mathematical Notes - The notion of the fan of a subgroup of a group, which was introduced in 1979 by Z. I. Borevich, is used to prove the supersolvability of finite groups. It is proved that a... 相似文献
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Suppose that H is a finite subgroup of a linear algebraic group,G. It was proved by Donkin that there exists a finite-dimensionalrational representation of G whose restriction to H is free.This paper gives a short proof of this in characteristic 0.The author also studies more closely which representations ofH can appear as a restriction of G. 相似文献