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本文研究有限群元素共轭类的平均长度问题.利用初等群论方法和有限群特征标理论,在共轭类平均长度为某一定数时,获得了对有限群结构的刻划,且对有限群数量性质的研究是有意义的. 相似文献
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证明了非幂零极大子群共轭类类数等于2的有限群必可解,并给出了非幂零极大子群同阶类类数等于2的非可解群的等价刻画. 相似文献
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本文首先给出Coxter群中二阶元的判定方法,应用到E6型有限wey1群及A21^(1)型仿射Wey1群,给出了其二阶元的共轭标准形与共轭类数. 相似文献
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特征标表中零点个数很少的有限可解群 总被引:3,自引:1,他引:2
(1)与(2)均曾研究过有某特征标恰在两个共轭类上取非零值的有限群。本文讨论上述情形的另一极端,即每个不可约特征标至多在p个共轭类上取零值的有限可解群,这里p为群阶的最小素因子,通过对极小非交换商群的分析,我们将刻划这类群的结构。 相似文献
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共轭类的长和有限群的结构 总被引:4,自引:1,他引:3
设G是有限群,并设Con(G)是由G的一切共轭类组成的集合。本文目的是考察Con(G)的算术结构对G的群结构的影响。我们着重于Con(G)的p-部分结构,并得到关于p-幂零群的两个定理。这里,p表示一个有限群的最小素因子。用这两个定理,我们还得到若干结果,其中两个改进了D.Chillag和M.Herzog关于共轭类长的两个结果。 相似文献
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Let φ be an automorphism of a free group Fn of rank n, and let Mφ = Fn ?φ ? be the corresponding mapping torus of φ. We study the group Out(Mφ) under certain technical conditions on φ. Moreover, in the case of rank 2, we classify the cases when this group is finite or virtually cyclic, depending on the conjugacy class of the image of φ in GL2(?). As an application, we solve the isomorphism problem for the family of F2-by-? groups, in terms of the two defining automorphisms. 相似文献
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Andrew Sale 《代数通讯》2013,41(2):873-897
Determining the length of short conjugators in a group can be considered as an effective version of the conjugacy problem. The conjugacy length function provides a measure for these lengths. We study the behavior of conjugacy length functions under group extensions, introducing the twisted and restricted conjugacy length functions. We apply these results to show that certain abelian-by-cyclic groups have linear conjugacy length function and certain semidirect products ?d ? ?k have at most exponential (if k > 1) or linear (if k = 1) conjugacy length functions. 相似文献
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Wang Jun-xinDu Xian-kun 《东北数学》2010,26(2):144-158
A finite group G is called a Camina group if G has a proper normal subgroup N such that gN is precisely a conjugacy class of G for any g ∈E G - N. In this paper, the structure of a Camina group G is determined when N is a union of 2, 3 or 4 conjugacy classes of G. 相似文献
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Using a strong version of the Curve Selection Lemma for real semianalytic sets, we prove that for an arbitrary connected Lie group G, each connected component of the set E_n(G)of all elements of order n in G is a conjugacy class in G. In particular, all conjugacy classes of finite order in G are closed. Some properties of connected components of E_n(G) are also given. 相似文献
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The object of this paper is to study (infinite) groups whose integral group rings have only trivial central units. This property is closely related to a property, here called the RS-property (see Ritter and Sehgal, Dokuchaev et al.) involving conjugacy in the group. 相似文献
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The object of this article is to study the connection between the structure of a finite group and the conjugacy class sizes of the p-singular elements of a finite group. The finite groups G in which every conjugacy class size of the p-singular elements satisfies some given arithmetic conditions are classified. 相似文献
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We prove that every topological conjugacy between two germs of singular holomorphic curves in the complex plane is homotopic to another conjugacy which extends homeomorphically to the exceptional divisors of their minimal desingularisations. As an application we give an explicit presentation of a finite index subgroup of the mapping class group of the germ of such a singularity. 相似文献
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We consider a group without infinite ascending chains of nilpotent subgroups and prove that if every two elements of some conjugacy class generates a nilpotent subgroup then the whole class also generates a nilpotent subgroup. 相似文献