真同态像都是挠模的挠自由模

This paper is devoted to proving the following fact :Let G be a Gabriel topology, E an injective module cogenerating torsion theory (T, F) associated to G. N_G= (0≠M∈F|M/L∈T for every nonzero submodu-le L?M} . then, M∈N_G if and only if1) M is uniform,2) every nonzero homomorphism form M into M is injective,3) M is a quasi-essential submodule of E.At the same time, we proved that if a module M∈N_G then M, M_G∈N_G.Fi-nally, we considered critically compressible modules, under the assumption that Gabriel topology G is perfect.     

从特殊线性群到一般射影线性群的同态的一个性质

设F,K为域,GLn（F）,SLn（F）分别表示F上的n级一般线生群和n级特殊线性群．PGLn（F）,PSLn（F）分别表示F上的n级射影一般线性群和n级射影特殊线性群．φ：SLn（F）→PGLn（K）,n≥3为非平凡同态．本文确定了当K的持征为2时η的—个性质．     

线性对流占优Sobolev方程的流线扩散有限元方法

Abastract. In this paper,a streamline-diffusion F. E. M. for linear Sobolev equations with con-vection-dominated term is given. According to the range of space-time F. E mesh parameter h,two choices for artifical diffusion parameter are presented,and for the corresponding computa-tion schemes the stability and error estimates in suitable norms are estabilished.     

区间值模糊命题逻辑系统的广义恒真式

建立区间值模糊命题逻辑系统F(∨，∧，σ┴，c)，其中，α^-θ┴b=(α^-)^c┴b^-,┴是I[0,1]中的t-余范；讨论系统F(∨，∧，σ┴，c)与对应的模糊命题逻辑系统F(∨，∧，σ┴，c)在广义恒真式方面的相互关系，得到定理：T^-[0,α]（F^-∨，∧，σ┴，c)=Tα(F(∨，∧，σ┴，c))。     

效应代数的同态

本文研究了维数大于等于3的可分Hillbert空间H的效应代数E(H)上的同态问题.利用投影算子以及线性延拓的方法,获得了效应代数E(H)上每个满的σ-正交完备的强同态?都具有形式?(A)=UAU*,当满足齐次性以及单边保序的条件时可以延拓到交换von-Neumann代数A到B(H)上一个有界*同态的结果.     

Homomorphisms Between Multiplicative Semigroups of Matrices Over Fields

Suppose F is a field, and n, p are integers with 1 ≤ p 〈 n. Let Mn（F） be the multiplicative semigroup of all n × n matrices over F, and let M^Pn（F） be its subsemigroup consisting of all matrices with rank p at most. Assume that F and R are subsemigroups of Mn（F） such that F M^Pn（F）. A map f ： F→R is called a homomorphism if f（AB） = f（A）f（B） for any A, B ∈F. In particular, f is called an endomorphism if F = R. The structure of all homomorphisms from F to R （respectively, all endomorphisms of Mn（F）） is described.     

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．     

B（E,F）中光滑Banach子流形B＊（E,F）

令E和F是Banach空间;B（E,F）,B^＋（E,F）,Φ（E,F）,SΦ（E,F）和R（E,F）分别表示映E到F的有界线性、双裂、Fredholm、半Fredholm和有限秩算子全体.令∑表示下列集合之一：{T∈Φ（E,F）：IndexT=constant和dimN（T）=constant},{T∈SΦ（E,F）：dimN（T）=constant＆lt;∞或codimR（T）=constant＆lt;∞之一成立}和{T∈R（E,F）：RankT=constant＆lt;∞},下面是已知的：∑是B（E,F）中的光滑子流形,且切空间T_A∑={B∈B（E,F）：BN（A） R（A）,（？）A∈∑}.然而,B^＊（E,F）={T∈B^＋（E,F）：dimN（T）=codimR（T）=∞},失去特征数dimN（A）,codimR（A）,index（A）和Rank（A）,寻找它的一个子类组成B（E,F）中的光滑子流形,这是很困难的.幸运地,我们发现B^＊（E,F）就是B（E,F）的一个光滑子流形,且在每一点A∈B^＊（E,F）它的切空间T_AB^＊（E,F）={T∈B（E,F）：TN（A） R（A）}.这样,B^＋（E,F）的几何结构被给出,亦即,B＋（E,F）是以上互不相交的诸光滑子流形的并．同时我们对任一A∈B＋（E,F）,给出了一个装配在一个固定的Banach空间上,通过A的光滑子流形s（A）．为了这些,许多广义逆扰动分析的结果被推广．特别地,在E：F：Rn情况下,我们得到：Rank（A）=r〈n,的奇异n×n矩阵全体∑r是B（R^n）的一个道路连通的光滑子流形且有维数dime∑r=2nr-r^2．这样,B（R^n）除熟知的代数和分析结构外,又有了一个像B^＋（E,F）一样的几何结构．     

域扩张时的李代数扩张

设E是特征零的代数封闭域,LE是E上L型有限维单李代效,F是E的包含素子域Q的子域,且|E:F]<∞.本文引入李代数的准子代数的概念,且F上同类型李代数LF就是LE的准子代数.本文定出了LE的包含LF的所有准子代数.     

Characterization of types of asymptotic discernibility of families of hypotheses

We give a characterization of the types of asymptotic discernibility of families of hypotheses in the case of hypothetical measures that are not, in general, mutually absolutely continuous. The case when the logarithm of the likelihood ratio admits an asymptotic expansion of the type of an expansion with local asymptotic normality is examined in detail. Examples are studied.Translated fromTeoriya Sluchainykh Protsessov, Vol. 15, pp. 64–71, 1987.     

Distribution of types of symmetry of tensors of high degree

The asymptotic distribution of tensors of degree N in symmetry types is studied in this paper.Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 155, pp. 181–186, 1986.     

Estimates of stability of characterization of additive types of distributions

An estimate of stability of characterization of distribution types is obtained for the case of additive types. Under some conditions, the estimate has the order ε^1/3L(ε), where L(ε) is a slowly varying function. Proceedings of the Seminar on Stability Problems for Stochastic Models, Moscow, Russia, 1996, Part I.     

一类完全正则半群簇子簇格的性质

本文研究了完全正则半群簇的子簇格［Ｖ＋∩ＰＶ，Ｖ＋∩ＰＶ］的某些格运算性质，我们证明了簇Ｖ＋∩ＰＶ可分解为Ｖ与Ｖ＋∩ＰＶ的并；对任意完全正则半群簇Ｗ，有Ｗ∩（Ｖ∨Ｖ＋∩ＰＶ）＝（Ｗ∩Ｖ）∨（Ｗ∩Ｖ＋∩ＰＶ）．特别地，我们得到了等式Ｖ＋∩ＰＶ＝Ｖ成立的若干条件．     

Study of the blow-up of solutions of systems of equations of hydrodynamic type

Mathematical Notes - We study the initial boundary-value problem for three-dimensional systems of equations of pseudoparabolic type. The system is similar to the Oskolkov system, but differs from...     

图表示范畴的两个子范畴

引进图表示范畴的两个子范畴,研究它们的同调性质。     

Emptiness of set of points of lower semicontinuity of Lyapunov exponents

We consider parametric families of differential systems with coefficients that are bounded and continuous on the half-line and uniformly in time continuously depend on a real parameter. For each Lyapunov exponent, we construct a family such that the Lyapunov exponent of its systems treated as a function of the parameter is not a lower semicontinuous function for any value of the parameter.