一类域上的线性变换环的群结构

In this paper, we introduce a practical method for obtaining the structure of the group of units for the ring of linear transformations of a vector space over an arbitrary field, and we give a further generalization of the result in [3].     

有限维线性空间上的极大线性变换群在几个线性空间上的群作用

群作用是研究群(特别是有限群)的一个外部方法.首先构作域上一有限维线性空间上的全线性变换半群的极大群,其次给出了三个群作用:极大群在其幺元的不动点子空间上的一个(自然的)群作用,两个极大群的(外)直积在两个极大群的幺元的不动点子空间的(外)直和上的一个群作用,两个极大群的(外)直积在两个极大群的幺元的不动点子空间之间的所有线性映射构成之集上的一个群作用.     

线性群的自同构群的一类子群

设E为任意域,F为E的子域,分别以T=GL（n,E),S=GL(n,F)表示域E、F上的n阶一般线性群（n≥2）,则S为T的子群。本确定T的自同构群AutT中保持S中每个元不动的自同构全体形成的群Gal(T/S)。     

线性群的自同构群的一类子群

设 E为任意域 ,F为 E的子域 ,分别以 T=GL( n,E) ,S=GL( n,F )表示域 E、F上的 n阶一般线性群 ( n≥ 2 ) ,则 S为 T的子群 .本文确定 T的自同构群 Aut T中保持 S中每个元不动的自同构全体形成的群 Gal( T/ S) .     

有限群的PCM-子群

本文研究了有限群的超可解性.利用Fitting子群的某些特殊子群的PCM性质对有限群结构的影响,获得了超可解群的一些充要条件.     

Chevalley群的一类子群的研究

设G＝L（F）是特征不为2的域F上Chevalley群,型为B1（l≥4）,Cl（l≥3）,Dl（l≥5）,E6,E7,E8或F4之一．当L（F）型为B4或F4时还假设F=F2设Lα1是L（F）的一类Levy子群．本文决定Lα1的正规化子在L（F）中的极大性．     

群（Q＊，·）的一类指数有限的子群

本文构造了群（Ｑ＊，·）的一类（无限多个）指数有限的真子群．     

有限群的X-s-置换子群

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.     

有限群的ss-置换子群

设G为有限群,称G的子群H为ss-置换子群,如果存在G的次正规子群B使得G=HB,且H与B的任意Sylow子群可以交换,即对任意X∈Syl（B）有XH=HX.利用子群的ss-置换性来研究有限群的结构,得到有限群超可解的两个充分条件.     

Uniform boundedness of torsion subgroups of linear groups

The torsion conjecture says： for any abelian variety A defined over a number field k, the order of the torsion subgroup of A（k） is bounded by a constant C（k,d） which depends only on the number field k and the dimension d of the abelian variety. The torsion conjecture remains open in general. However, in this paper, a short argument shows that the conjecture is true for more general fields if we consider linear groups instead of abelian varieties. If G is a connected linear algebraic group defined over a field k which is finitely generated over Q,Г is a torsion subgroup of G（k）. Then the order of Г is bounded by a constant C＇（k, d） which depends only on k and the dimension d of G.     

Periodic subgroups of projective linear groups in positive characteristic

We classify the maximal irreducible periodic subgroups of PGL(q, ), where is a field of positive characteristic p transcendental over its prime subfield, q = p is prime, and ^× has an element of order q. That is, we construct a list of irreducible subgroups G of GL(q, ) containing the centre ^×1 _q of GL(q, ), such that G/ ^×1 _q is a maximal periodic subgroup of PGL(q, ), and if H is another group of this kind then H is GL(q, )-conjugate to a group in the list. We give criteria for determining when two listed groups are conjugate, and show that a maximal irreducible periodic subgroup of PGL(q, ) is self-normalising.      

Carter subgroups of finite groups

It is proven that the Carter subgroups of a finite group are conjugate. A complete classification of the Carter subgroups in finite almost simple groups is also obtained.     

Finite groups with some ?-quasinormal minimal subgroups

We use ?-quasinormal condition on minimal subgroups to Characterize the structure of a finite group through the theory of formation. We give some equivalent conditions of a nilpotent group or a saturated formation containing the nilpotent groups. Our results generalize earlier theorems of Yokoyama, Ballester-Bolinches and Pedraza Aguilera.     

Automorphisms and normal subgroups of linear groups

In the present paper, the properties of orders of coprime automorphisms of irreducible linear groups are established and sufficient conditions for the existence of a normal Hall π-subgroup in a given π-separable irreducible complex linear group are obtained. Библиография: 11 наэваний.     

On subnormal subgroups of linear groups

We describe the subnormal subgroups of 2-dimensional linear groups over local and full rings in which 2 is invertible, as well as the subnormal subgroups of symplectic groups over local rings in which 2 is invertible.     

Finite groups with some ss-quasinormal and c-normal subgroups

Let ℱ be a saturated formation containing the class of supersolvable groups. In this paper, we use c-normal subgroups and ss-quasinormal subgroups to give criteria for a group to belong to ℱ.     

Locally soluble infinite-dimensional linear groups with restrictions on nonAbelian subgroups of infinite ranks

We are concerned with locally soluble linear groups of infinite central dimension and infinite sectional p-rank, p ⩾ 0, in which every proper non-Abelian subgroup of infinite sectional p-rank has finite central dimension. It is proved that such groups are soluble. Translated from Algebra i Logika, Vol. 47, No. 5, pp. 601–616, September–October, 2008.