特定阶的子群都同构且交换的有限p-群

研究某些子群同构的有限p-群是很有趣的.例如,Hermann和Mann都曾研究过极大子群都同构的有限p-群,但这类群的结构非常复杂,到现在人们都没能给出其分类.研究了特定阶的子群都同构且交换的有限p-群,并给出其分类.     

用子群计数刻画有限p群

本文利用子群计数刻画了型不变量为(p~k,p,p,…,p)的交换p群以及亚循环的内交换p群(其中p为奇素数).     

非交换商群的中心均循环的有限p群

称有限群G为QCC群,若对G中的任意非交换商群G/N,均有Z(G/N)循环,其中1≠N(?)G.本文对QCCp群进行了研究,证明了非交换QCCp群或为特殊群、或换位子群的阶为p、或生成元的个数为2.进一步,证明了二元生成且|G|≠35的非交换QCC 2群(QCC 3群)G为内交换群或极大类群.     

满足|I_3(G)|=4的有限2群的完全分类

完全分类了满足|I_3(G)|=4的有限2群,其中I_k(G)表示G的所有p~k阶子群的交.     

某些以 p 群为自同构群的 p6 阶群

该文给出了三个以 p 群为自同构群的 p⁶ 阶群, 并得到了它们的自同构群的阶. 在这里 p 表示奇素数.     

交换子群较小的一类有限p群

研究了阶为p(m(m+1)/2)且交换子群的最大阶为p(m)的有限群,得到了这类特殊的p群的几个性质,给出了满足极大类条件的这类p群的同构分类.     

所有子群皆循环或正规的有限2-群

研究了所有子群皆循环或正规的有限2群,并给出了其完全分类.     

内交换p群的中心扩张(Ⅳ)

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.     

某些以p群为自同构群的p^6阶群

该文给出了三个以p群为自同构群的p6阶群,并得到了它们的自同构群的阶.在这里p表示奇素数.     

有限生成的子群为3-生成的可解群

设Ｇ是个可解群，Ｇ的每个有限生成子群都是３生成的，则当Ｇ含有无限阶元时，Ｇ（６）＝１，但当Ｇ为挠群时，Ｇ的导出长度是不能被界定的．     

Finite p-groups whose nonnormal subgroups have orders at most p 3

We classify finite p-groups all of whose nonnormal subgroups have orders at most p3, p odd prime. Together with a known result, we completely solved Problem 2279 proposed by Y. Berkovich and Z. Janko in Groups of Prime Power Order, Vol. 3.     

Finite p-groups with a minimal non-abelian subgroup of index p(Ⅱ)

We classify completely three-generator finite p-groups G such that Ф(G)≤Z(G)and|G′|≤p2.This paper is a part of the classification of finite p-groups with a minimal non-abelian subgroup of index p,and solve partly a problem proposed by Berkovich.     

Finite p-groups All of Whose Minimal Nonabelian Subgroups are Nonmetacyclic of Order p3

Assume p is an odd prime. We investigate finite p-groups all of whose minimal nonabelian subgroups are of order p³. Let P₁-groups denote the p-groups all of whose minimal nonabelian subgroups are nonmetacyclic of order p³. In this paper, the P₁-groups are classified, and as a by-product, we prove the Hughes' conjecture is true for the P₁-groups.     

Finite p-Groups All of Whose Proper Quotient Groups are Abelian or Inner-Abelian

In this article, finite p-groups all of whose proper quotient groups are abelian or inner-abelian are classified. As a corollary, finite p-group all of whose proper quotient groups are abelian, and finite p-groups all of whose proper sections are abelian or inner-abelian are also classified.     

Sylow子群的极大子群在局部子群中的 π - 拟正规性

有限群 G 的一个子群 H 称为在 G 中 π - 拟正规的, 如果 H 和G的每一个Sylow子群可交换. 自从这一概念被 Kegel 提出后, 许多学者相继研究了某些子群在G中的 π - 拟正规性对有限群结构的影响.该文将上述条件局部化,即在群 G 的Sylow 子群的正规化子中来研究这一性质与有限群结构之间的关系.     

Finite p-Groups with a Cyclic Subgroup of Index p3

We classify up to isomorphism those finite p-groups,for odd primes p,which contain a cyclic subgroup of index p3.     

3p阶亚循环群的连通4度Cayley图

研究3p阶(p是大于3的素数)亚循环群的连通4度Cayley图.主要决定了其全自同构群的结构,并由此得到这类图的CI性、正规性和弧传递性.用到单群分类定理.     

On a Domain in which any Two Points are Joined by Finite Numbers of Arbitrarily Small Homeomorphisms

In this paper the domain in which any two points are joinedby finite numbers of arbitrarily small homeomorphisms is studied,and two examples are given. 1991 Mathematics Subject Classification54F15.     

Finite p-Groups in Which the Number of Subgroups of Possible Order is Less Than or Equal to $p^3 $

In this paper, groups of order pn in which the number of subgroups of possible order is less than or equal to p3 are classified. It turns out that if p 2, n ≥ 5, then the classification of groups of order pn in which the number of subgroups of possible order is less than or equal to p3 and the classification of groups of order pn with a cyclic subgroup of index p2 are the same.