l-群的极小素子群

本文研究l-群的极小素子群,主要证明如下结果:设G是一个l-群.（1）N∈Γ_m（G）,则N=a^⊥当且仅当{P_N^C}是一个归纳集;（2）g∈G⁺,如果g是特殊的,且g的唯一值是原子,则g^⊥∈Γ_m（G）;（3）G∈B_w,Γ₁（C）是原子的当且仅当Γ_m(G）?Γ₁（G）。     

利用二阶上三角矩阵构造各类非交换的序群

利用二阶上三角矩阵分别构造了非交换的序群、拟序群、拟偏序群和拟格序群.     

格序群的l—自由积的表示

本文给出了两个非平凡可数格序群的ｌ－自由积在有理数集Ｑ上的高ｏ－可迁忠实表示。证明了格序群的ｌ－自由积的向量格复盖与格序群的向量格复盖的ｌ－自由积之间的同构关系；格序群与格序群的反向系统的ｌ－自由积的反向极限与反向极限的自由积之间的同构关系。作为应用，本文给出了两个非平凡可数格序群的ｌ－自由积的复盖在Ｑ上的高ｏ－可迁忠实表示和下有向偏序集上的非平凡可数格序群的反向系统的反向极限在Ｑ上的高ｏ－可迁忠     

格序群上的C-拓扑

令C为格序群A的某些正元组成的一个容许子集,Gusid证明A可以被赋予一个C-拓扑使得A成为拓扑群．本文证明C-拓扑实际上使得A成为拓扑格序群,给出了Gusid定理的推广,并揭示了Gusid C-群的自然性．而且,我们证明C-拓扑使得任何Archimedean格序向量空间成为孔拓扑格向量空间．同时,构造了一个简单的例子说明C-群不一定是乃的．另一个例子证明T2拓扑格向量空间也不一定为C—Archimedean．     

左剩余格序广群上的矩阵方程

研究左剩余格序广群L上矩阵方程AX=B的解集以及所有n阶矩阵的集合Mn（L），将文献[3]中的一切结果推广到左剩余格序广群上，而且证明了若L是左剩余格序广群，则Mn（L）也组成左剩余格序广群。此外，还指出了文献[1]中主要结论的错误。     

格序群的扭自由根式格

证明了发下结果；格序群的扭自由根式全体构成一个完备格县这个格满足并无限分配律，所有主扭自由根式构成这个格的一个理想。     

关于格序群中交换性的注记

本文利用非交换格序群的一个例,证明了交换格序群一些命题中交换性条件的必要性。例令G是一个群有三个无穷阶、线性无关的生成元a,b,c;并且定义关系a+b=b+a,a+c—c+b,b+c—c+a;G~+包含ma+m＇b+nc当且仅当n>0或n—0而m≥O,m＇≥0。     

弱奇异l-群的结构

引入弱奇异元及弱奇异l-群的概念，通过建立弱奇异元及弱奇异l-群的刻划，研究了一般弱奇异l-群的性质及相关的结构，部分地改进了有关奇异l-群已有的结果．     

格序群的极小扭类,准素扭类和极扭类

本文给出了格序群的扭类是准素扭类的一个充分必要条件，证明了任一非零扭类至少包含一个极小扭类，从而将文〔１〕和〔２〕中在有限制条件情况下的有关结论推广到无任何限制条件的情形。本文还给出了一个扭类是极扭类的几个充分必要条件，并得到了格序群的极扭类、准素扭类和极小扭类之间的关系。     

有限群的超可解性

本文利用子群格的模的性质对有限群进行研究 ,得到了有限超可解群的若干充分条件 ,推广了许多已有结果 .     

On p-nilpotency of finite groups with some subgroups π-quasinormally embedded

Summary A subgroup H of a group G is said to be π-quasinormal in G if it permutes with every Sylow subgroup of G, and H is said to be π-quasinormally embedded in G if for each prime dividing the order of H, a Sylow p-subgroup of H is also a Sylow p-subgroup of some π-quasinormal subgroups of G. We characterize p-nilpotentcy of finite groups with the assumption that some maximal subgroups, 2-maximal subgroups, minimal subgroups and 2-minimal subgroups are π-quasinormally embedded, respectively.     

Maximal and Sylow Subgroups of Solvable Finite Groups

The structure of finite solvable groups in which any Sylow subgroup is the product of two cyclic subgroups is studied. In particular, it is proved that the nilpotent length of such a group is no greater than 4. It is also proved that the nilpotent length of a finite solvable group in which the index of any maximal subgroup is either a prime or the square of a prime or the cube of a prime does not exceed 5.     

<Emphasis Type="Italic">τ</Emphasis>-primitive subgroups of finite groups

We study the influence of τ-primitive subgroups on the structure of finite groups. As applications, we give the structure of the finite groups whose every subgroup is an intersection of subgroups of prime power index and the structure of finite groups whose every subnormal subgroup is an intersection of subnormal subgroups of prime power index.     

包含在 $PSU_3(q)$中的几乎单群($q$为奇素数方幂)

应用置换群 的理论列出包含在 ${\rm PSU}_3(q)$ ($q$为奇素数的方幂)中的几乎单的子群.     

S-quasinormality of finite groups

Let d be the smallest generator number of a finite p-group P, and let be a set of maximal subgroups of P such that . In this paper, the structure of a finite group G under some assumptions on the S-quasinormally embedded or SS-quasinormal subgroups in , for each prime p, and Sylow p-subgroups P of G is studied.     

S-拟正规嵌入子群

群G的一个子群H称为在G中S-拟正规嵌入的,如果对H阶中的每一个素因子p,H的Sylowp-子群也是G的某个S-拟正规子群的Sylowp-子群.利用子群的S-拟正规嵌入性给出了群为p-幂零群及超可解群的一些特征.     

能表示成四个真子群并的有限群

本文研究了子群覆盖问题.利用计算子群阶的方法,给出了能表示成p+1或p+2个真子群并的有限群G的结构,这里p是群G阶的最小素因子,从而推广了文献[1]中的结果.     

Congruence subgroups of Hecke groups

Hecke groups are an important tool in subgroups of Hecke groups play an important rule investigating functional equations, and congruence in research of the solutions of the Dirichlet series. When q, m are two primes, congruence subgroups and the principal congruence subgroups of level m of the Hecke group H（√q） have been investigated in many papers. In this paper, we generalize these results to the case where q is a positive integer with q ≥ 5, √q ￠ Z and m is a power of an odd prime.     

Finite Groups with Some Subgroups of Prime Power Order S-Quasinormally Embedded

Abstract

A subgroup of a group G is said to be S-quasinormal in G if it permutes with every Sylow subgroup of G. A subgroup H of a group G is said to be S-quasinormally embedded in G if every Sylow subgroup of H is a Sylow subgroup of some S-quasinormal subgroup of G. In this paper we examine the structure of a finite group G under the assumption that certain abelian subgroups of prime power order are S-quasinormally embedded in G. Our results improve and extend recent results of Ramadan [Ramadan, M. (2001). The influence of S-quasinormality of some subgroups of prime power order on the structure of finite groups. Arch. Math. 77:143–148].     

Principal Congruence Subgroups of Hecke Groups H（√q）

Using the notion of quadratic reciprocity, we discuss the principal congruence subgroups of the Hecke groups H（√q）,q 〉 5 prime number.