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1.
设N,H是任意的群.若存在群G,它具有正规子群≤Z(G),使得≌N且G/≌H,则称群G为N被H的中心扩张.本文完全分类了当N为p~3阶初等交换p群及H为内交换p群时,N被H的中心扩张得到的所有不同构的群.从而我们完全分类了初等交换p群被内交换p群的中心扩张得到的所有不同构的群.  相似文献   

2.
曲海鹏  张小红 《数学学报》2010,53(5):933-944
设N,H是任意的群.若存在群G,它具有正规子群N≤Z(G),使得N≌N且G/N≌H,则称群G为N被H的中心扩张.本文完全分类了当N为循环p群,H为内交换p群时,N被H的中心扩张得到的所有不同构的群.  相似文献   

3.
设N,H是任意的群.若存在群G,它有正规子群N≤Z(G),使得N≌N且G/N√≌H,则称群G为N被H的中心扩张.完全分类了当N为2阶循环群及H为极大类2群时,N被H的中心扩张得到的所有互不同构的群.  相似文献   

4.
设N,H是任意的群.若存在群G,它具有正规子群N≤Z(G),使得N≌N且G/N≌H,则称群G为N被H的中心扩张.完全给出了当|N|=2,H为亚循环2群时,N被H的中心扩张得到的所有不同构的群.  相似文献   

5.
设N,H是任意的群.若存在群G,它具有正规子群■,使得■且■,则称群G为N被H的中心扩张.完全给出了当|N|=p,H为奇阶亚循环p群时,N被H的中心扩张得到的所有不同构的群.  相似文献   

6.
研究了内交换p-群G是capable群需要满足的条件,得到了这类群是capable群的充要条件.并由内交换p-群G构造得到了群H,使得H满足HH/Z(H)≌G.  相似文献   

7.
无限循环群被有限生成Abel群的中心扩张   总被引:1,自引:0,他引:1  
设G是无限循环群被有限生成Abel群的中心扩张,T是G的中心ζG的挠子群.如果T的阶与ζG/(G'⊕T)的挠子群的阶互素,那么群G可分解为G=S×F×T,其中S= 这里d_i都是正整数,满足d_1|d_2|…|d_r,F是秩为s的自由Abel群,T是有限Abel群,T=Z_(e_1)⊕Z_(e_2)⊕…⊕Z_e_t,e_11,满足e_1|e_2|…|e_t,并且(d_1,e_t)=1.进一步,(d_1,d_2,…,d_T;s;e_1,e_2,…,e_t)是群G的同构不变量,即若群H也是无限循环群被有限生成Abel群的中心扩张,T_H是ζH的挠子群.如果T_H的阶与ζH/(H'⊕T_H)的挠子群的阶互索,那么G同构于H的充要条件是它们有相同的不变量.显然,这个结果涵盖了有限生成Abel群的结构定理.  相似文献   

8.
如果G的所有子群都是次正规的,而且G满足下面条件之一,那么G是幂零群.(1)G有一个次正规列1△H△K△G,其中K/H是幂零群,H和G/K是有限生成的;(2)G有一个正规子群N使得,N在其子集的中心化子上满足极小条件,并且G/N是有限生成的.  相似文献   

9.
设F是一个群系.群G的一个子群H在G中F-S-可补,如果存在G的子群K,使得G=HK且K/K∩HG∈F,其中HG表示G包含在H中的最大的正规子群.本文利用群系理论研究子群的F-S-可补性对有限群结构的影响,得到如下结论:设F是子群闭的局部群系,G是有限群且GF是可解的.则G∈F的充要条件是下列条件之一:(1)G存在正规子群N使得G/N∈F且N的极小子群及4阶循环子群(p=2)均在G中F-S-可补.(2)G存在正规子群N使得G/N∈F,N的4阶循环子群在G中有F-S-补且N的极小子群皆包含在Z∞F(G)中.应用这些结论,可以得到一些推论,其中包括已知的相关结果.  相似文献   

10.
本文研究了Abel群上 Cayley图的Hamilton圈分解的问题.利用"字"和H方操作法,获得了Abel群上4度Cayley图的Hamilton圈分解方案和理论证明.  相似文献   

11.
The structural characteristic of the normal divisor in a locally nilpotent torsion-free group is given. Moreover, a property of structural isomorphisms of locally nilpotent groups containing no less than two independent elements of infinite order is proved: if H is the subgroup of the mentioned group G, N(H) is its normalizer in G, and is a structural isomorphism of the group G, then N(H) = N(H ).Translated from Matematicheskie Zametki, Vol. 11, No. 4, pp. 389–396, April, 1972.  相似文献   

12.
Let M be any quasivariety of Abelian groups, (H) be the dominion of a subgroup H of a group G in M, and Lq(M) be the lattice of subquasivarieties of M. It is proved that (H ) coincides with a least normal subgroup of the group G containing H, the factor group with respect to which is in M. Conditions are specified subject to which the set L(G,H,M) = { (H) | N Lq(M)} forms a lattice under set-theoretic inclusion and the map : Lq(M) L(G,H,M) such that (N) = (H) for any quasivariety N Lq(M)is an antihomomorphism of the lattice L q (M) onto the lattice L(G, H, M).__________Translated from Algebra i Logika, Vol. 44, No. 2, pp. 238–251, March–April, 2005.  相似文献   

13.
We initiate the study of the class of profinite graphs defined by the following geometric property: for any two vertices and of , there is a (unique) smallest connected profinite subgraph of containing them; such graphs are called tree-like. Profinite trees in the sense of Gildenhuys and Ribes are tree-like, but the converse is not true. A profinite group is then said to be dendral if it has a tree-like Cayley graph with respect to some generating set; a Bass-Serre type characterization of dendral groups is provided. Also, such groups (including free profinite groups) are shown to enjoy a certain small cancellation condition.

We define a pseudovariety of groups to be arboreous if all finitely generated free pro- groups are dendral (with respect to a free generating set). Our motivation for studying such pseudovarieties of groups is to answer several open questions in the theory of profinite topologies and the theory of finite monoids. We prove, for arboreous pseudovarieties , a pro- analog of the Ribes and Zalesski product theorem for the profinite topology on a free group. Also, arboreous pseudovarieties are characterized as precisely the solutions to the much studied pseudovariety equation .

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14.
Let W(G) be the W-algebra generated by the left regular representation of a discrete group G. We discuss the relationship between minimal central idempotents of W(G) and certain positiv definit functions on G. As a main result we get a characterisation of those groups G for which W(G)I {O} and W(G)II is a direct product of factors. If one includes the case W(G)II={O} these are precisely finite extensions of groups H, where H is abelian or nilpotent of class 2 with finite center and commutatorsubgroup of prime order.  相似文献   

15.
套代数上的广义Jordan中心化子   总被引:2,自引:1,他引:1  
杨翠  张建华 《数学学报》2010,53(5):975-980
设H是实数域或复数域F上的Hilbert空间,N为H上的非平凡套,τ(N)为相应的套代数,并且φ:τ(N)→τ(N)是一个可加映射.本文证明了如果存在正整数m,n,p,使得(m+n)φ(A~(p+1))=mφ(A)A~p+nA~pφ(A)或φ(A~(m+n+1))=A~mφ(A)A~n对所有的A∈τ(N)成立,则存在λ∈F,使得对所有的A∈τ(N),有φ(A)=λA.  相似文献   

16.
Let H be the group obtained by taking the product of n copies of the maximal ideal of the ring of integers 0 of a local field of characteristic 0 with an algebraically closed residue field k of characteristic p>0, and let the composition law be defined as for an n-parametric commutative formal group over 0. Let the kernel of multiplication by p in H be finite. A filtration pmH (m0 is an integer) in H is introduced whose properties allow us to obtain an exact sequence of proalgebraic groups 0Z p r WsH 0, where Zp and W are the additive groups of p-adic integers and Witt vectors of infinite length over k, respectively; r0 and s>0 are integers.Translated from Matematicheskie Zametki, Vol. 13, No. 4, pp. 573–576, April, 1973.In conclusion, I would like to thank O. N. Vvedenskii, under whose guidance this paper was completed.  相似文献   

17.

We show that . We first use the Connes-Tzygan exact sequence to prove that this is equivalent to the vanishing of the third cyclic cohomology group , where is the non-unital Banach algebra , and then prove that .

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18.
In this paper, we discuss finite rank operators in a closed maximal triangular algebra . Based on the following result that each finite rank operator of can be written as a finite sum of rank one operators each belonging to , we proved that , where , if ; and , if . We also proved that the Erdos Density Theorem holds in if and only if is strongly reducible.

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19.
We consider the existence and stability of an almost periodic solution of the following hybrid system:
(1)
where if θit<θi+1,i=…−2,−1,0,1,2,…, is an identification function, θi is a strictly ordered sequence of real numbers, unbounded on the left and on the right, pj,j=1,2,…,m, are fixed integers, and the linear homogeneous system associated with (1) satisfies exponential dichotomy. The deviations of the argument are not restricted by any sign assumption when existence is considered. A new technique of investigation of equations with piecewise argument, based on integral representation, is developed.  相似文献   

20.
In [6] S. Shelah showed that in the endomorphism semi-groupof an infinitely generated algebra which is free in a varietyone can interpret some set theory. It follows from his resultsthat, for an algebra F which is free of infinite rank in avariety of algebras in a language L, if > |L|, then thefirst-order theory of the endomorphism semi-group of F, Th(End(F)),syntactically interprets Th(,L2), the second-order theory ofthe cardinal . This means that for any second-order sentence of empty language there exists *, a first-order sentence ofsemi-group language, such that for any infinite cardinal >|L|, Th(,L2)*Th(End(F)) In his paper Shelah notes that it is natural to study a similarproblem for automorphism groups instead of endomorphism semi-groups;a priori the expressive power of the first-order logic for automorphismgroups is less than the one for endomorphism semi-groups. Forinstance, according to Shelah's results on permutation groups[4, 5], one cannot interpret set theory by means of first-orderlogic in the permutation group of an infinite set, the automorphismgroup of an algebra in empty language. On the other hand, onecan do this in the endomorphism semi-group of such an algebra. In [7, 8] the author found a solution for the case of the varietyof vector spaces over a fixed field. If V is a vector spaceof an infinite dimension over a division ring D, then the theoryTh(, L2) is interpretable in the first-order theory of GL(V),the automorphism group of V. When a field D is countable anddefinable up to isomorphism by a second-order sentence, thenthe theories Th(GL(V)) and Th(, L2) are mutually syntacticallyinterpretable. In the general case, the formulation is a bitmore complicated. The main result of this paper states that a similar result holdsfor the variety of all groups.  相似文献   

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