G—半局部环及其同调维数

本文中讨论了一类比半局部环更广的环类，即Ｇ－半局部环，对Ｇ－半局部我们通过模去环的左Ｓｏｃｈｅ及Ｊａｃｏｂｓｏｎ根，研究了环的同调维数，并得到Ｇｄ（Ｒ／Ｓ）＝Ｇｄ（Ｒ／Ｓ∩Ｊ），式中的Ｇｄ表示环Ｒ的左整体维数或右整体维数，Ｓ＝Ｓｏｃ（Ｒ＾Ｒ）以及Ｊ是环Ｒ的Ｊａｃｏｂｓｏｎ根，当Ｒ还时半本原环时，即得Ｇｄ（Ｒ／Ｓ）＝Ｇｄ（Ｒ）。     

临界可压缩模类与弱Jacobson根

本文讨论临界可压缩模类和结合环的弱Ｊａｃｏｂｓｏｎ根．首先，我们证明了非平凡的临界可压缩模类是素模的特殊类．其次，我们引入结合环的弱Ｊａｃｏｂｓｏｎ根．弱Ｊａｏｎｂｓｏｎ根是特殊根．最后，我们给出有关弱本原环，半弱本原环和弱Ｊａｃｏｂｓｏｎ根环的某些性质．     

J-半单亚直既约环类确定的上限

Ｆ．Ａ．Ｓｚａｓｚ在［１］中提出公开问题５５：设Ｋ是Ｊａｃｏｂｓｏｎ根为零的全体亚直既约环类,研究类Ｋ确定的上根．本文对此进行了研究,证明了Ｊａｃｏｂｓｏｎ根为零的全体亚直既约环类Ｋ确定的上根Ｒ是特殊根,它介于Ｊａｃｏｂｓｏｎ根与Ｂｒｏｗｎ－ＭｃＣｏｙ根之间．并给出任意结合环Ａ为Ｒ－根环的充要条件．     

关于二宽度CSL代数的Jacobson根

Ｈｏｐｅｎｗａｓｓｅｒ Ａ［１］猜想ＣＳＬ代数上满足 Ｒｉｎｇｒｏｓｅ条件的算子集正是它的Ｊａｃｏｂｓｏｎ根,Ｄａｖｉｄｓｏｎ Ｋ．Ｒ．［２］证明了对于二宽度 ＣＳＬ代数,上述猜想是完全正确的．本文不仅清楚地刻画了二宽度ＣＳＬ代数Ｊａｃｏｂｓｏｎ根的结构,而且为研究ＣＳＬ代数的根提供了一种途径．设是由可分Ｈｉｌｂｅｒｔ空间上的套Ｍ和Ｎ生成的二宽度 ＣＳＬ,且 Ｗ＝ Ｍ∩Ｎ;本文得到二宽度 ＣＳＬ代数的 Ｊａｃｏｂｓｏｎ根与套Ｗ的根Ｒｗ,强根三者之间的一个重要关系同时也给出了真包含Ｒｗ的充分必要条件是Ｍ≠Ｎ且Ｍ≠Ｎ⊥．     

关于环的极大Order的一个注记

本文的目的是讨论环Ｒ何时成为一个半单Ａｒｉｉｎ环的极大Ｏｒｄｅｒ问题，得到了主要结果是：若Ｒ是左和右Ｎｏｅｔｈｅｒ半索环，Ｐ是Ｒ的包含在Ｊａｃｏｂｓｏｎ根中的可逆理想，使得Ｒ／Ｐ是一个半单Ａｒｔｉｎ环的极大Ｏｒｄｅｒ，则Ｒ是一个半单Ａｒｔｉｎ环的极大Ｏｒｄｅｒ。     

关于MHR环的根

本文证明了对ＭＨＲ环来说，Ｂｅａｒ根与有极小右理想的单环类决定的上根Ｕ在强意义之下是一致的，以及Ｕ根与Ｚ根在弱意义之下是一致的。推广了文「１」中对ＭＨＲ环来说，Ｂｅａｒ根与Ｊａｃｈｏｂｓｏｎ根在强意义之下是一致的，以及Ｊａｃｏｂｓｏｎ根与Ｚ根在弱意义之下一致的结果。     

分次环的分次Jacobson根

本文通过引入弱拟正则元的概念，对一般Ｍｏｎｏｉｄ分次环Ａ（未必有１）给出以内部元素刻划的分次Ｊａｃｏｂｓｏｎ根ＪＧ（Ａ）．证明当Ａ有１时，ＪＧ（Ａ）与通常定义的Ｊｇ（Ａ）相等．对ＪＧ（Ａ）性质的讨论，推广了最近的许多结果．作为应用，我们给出了Ａｒｔｉｎ分次环的全部基本结构定理．     

The Jacobson Property of Group Rings and Its Generalizations

Ｔｈｅ　Ｊａｃｏｂｓｏｎ　Ｐｒｏｐｅｒｔｙ　ｏｆ　Ｇｒｏｕｐ　Ｒｉｎｇｓ　ａｎｄ　Ｉｔｓ　ＧｅｎｅｒａｌｉｚａｔｉｏｎｓＺｈｕＹｕａｎｓｅｎ（朱元森）ａｎｄｗａｎｇＺｈｉｘｉ（王志玺）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＨｅｂｅｉＴｅａ...     

关于Gould和Jacobson的一个未解决问题

关于Ｇｏｕｌｄ和Ｊａｃｏｂｓｏｎ的一个未解决问题黄国泰（海南师范学院海口５７１１５８）关键词：广义Ｒａｍｓｅｙ数；分解图；换点ＡＭＳ（１９９１）主题分类：０５Ｃ５５．关于简单图Ｇ１和Ｇ。的广义Ｒａｍｓｅｖ数是使得下述条件成立的最小正整数Ｐ：如果Ｋｐ＝...     

路代数的有向图特征与Brown—McMoy根

本文解决路代数中若干遗留问题，给出本原路代数，（右）Ｇｏｌｄｉｅ路代数的有向图特征，证明广义路代数的Ｒｒｏｗｎ－ＭｃＣｏｙ根与它的Ｊａｃｏｂｓｏｎ根不必重合。     

RECENT PROGRESS ON SPHERICAL HARMONIC APPROXIMATION MADE BY BNU RESEARCH GROUP ——In memory of Professor Sun Yongsheng

As early as in 1990, Professor Sun Yongsheng, suggested his students at Beijing Normal University to consider research problems on the unit sphere. Under his guidance and encouragement his students started the research on spherical harmonic analysis and approximation. In this paper, we incompletely introduce the main achievements in this area obtained by our group and relative researchers during recent 5 years （2001-2005）. The main topics are： convergence of Cesaro summability, a.e. and strong summability of Fourier-Laplace series; smoothness and K-functionals; Kolmogorov and linear widths.     

Boundedness for commutators of multipliers on Hardy type spaces

In this paper, we study the commutators generalized by multipliers and a BMO function. Under some assumptions, we establish its boundedness properties from certain atomic Hardy space Hb^p（R^n） into the Lebesgue space L^p with p 〈 1.     

A unified approach to certain problems of best local approximation

In this paper we study best local quasi-rational approximation and best local approximation from finite dimensional subspaces of vectorial functions of several variables. Our approach extends and unifies several problems concerning best local multi-point approximation in different norms.     

Towards Excellence in Science Chinese Academy of Sciences

<正>May 26,2014,Beijing Science is a human enterprise in the pursuit of knowledge.The scientific revolution that occurred in the 17th Century initiated the advances of modern science.The scientific knowledge system created by     

THE 8~(th) INTERNATIONAL CONGRESS ON INDUSTRIAL AND APPLIED MATHEMATICS

<正>August 10-14,2015Beijing,ChinaThe International Congress on Industrial and Applied Mathematics(ICIAM)is the premier international congress in the field of applied mathematics held every four years under the auspices of the International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists     

Bounds for the zeros of polynomials

Let P(z)=∑↓j=0↑n ajx^j be a polynomial of degree n. In this paper we prove a more general result which interalia improves upon the bounds of a class of polynomials. We also prove a result which includes some extensions and generalizations of Enestrǒm-Kakeya theorem.     

Boundedness of commutators related to Marcinkiewicz integrals on hardy type spaces

In this paper, the authors study the boundedness of the operator [μΩ, b], the commutator generated by a function b ∈ Lipβ(Rn)(0 ＜β≤ 1) and the Marcinkiewicz integrals μΩ, on the classical Hardy spaces and the Herz-type Hardy spaces in the case Ω∈ Lipα(Sn-1)(0 ＜α≤ 1).     

Generalization of the interaction between Haar approximation and polynomial operators to higher order methods

In applications it is useful to compute the local average empirical statistics on u. A very simple relation exists when of a function f（u） of an input u from the local averages are given by a Haar approximation. The question is to know if it holds for higher order approximation methods. To do so, it is necessary to use approximate product operators defined over linear approximation spaces. These products are characterized by a Strang and Fix like condition. An explicit construction of these product operators is exhibited for piecewise polynomial functions, using Hermite interpolation. The averaging relation which holds for the Haar approximation is then recovered when the product is defined by a two point Hermite interpolation.     

Jacobi polynomials used to invert the laplace transform

Given the Laplace transform F(s) of a function f(t), we develop a new algorithm to find an approximation to f(t) by the use of the classical Jacobi polynomials. The main contribution of our work is the development of a new and very effective method to determine the coefficients in the finite series expansion that approximation f(t) in terms of Jacobi polynomials. Some numerical examples are illustrated.