一类线性算子族在t〉0上的紧性

考虑了C1-正则半群{S（t）}t≥0和C2-正则半群{T（t）}t≥0之差△（t）=S（t）C1-T（t）C2在一定假定条件下的紧性．     

关于集合\partial_uf(X)的结构与计算

集会\partial_ｕｆ（Ｘ）在非光滑规划的最优性判定条件中起着重要作用。本文探讨了ｕｆ（ｘ）的结构，给出了计算方案及与函数正则性的关系，最后给出了主要定理的几个应用实例．     

关于集合_uf（X）的结构与计算

集会_ｕｆ（Ｘ）在非光滑规划的最优性判定条件中起着重要作用。本文探讨了ｕｆ（ｘ）的结构，给出了计算方案及与函数正则性的关系，最后给出了主要定理的几个应用实例．     

广义联图的正则性

讨论了两个图的广义联图的End-正则性,给出了当图X、Y的广义联图G（y1,…ym）End-正则时,图X也End-正则应满足的条件。     

Retakh条件(M0)与弱(序列式)紧正则性

本文研究了弱（序列式）紧正则诱导极限与凸弱（序列式）紧正则诱导极限.满足Retakh条件（M₀）的（LF）-空间必为凸弱（序列式）紧正则的,但未必为弱（序列式）紧正则的.对于弱序列式完备Frechet空间的可数诱导极限,Retakh条件（M₀）蕴涵弱（序列式）紧正则性.特别地,对于Kothe（LF）-序列空间Ep（1≤p<∞）,Retakh条件（M₀）等价于弱（序列式）紧正则性.对于这类空间,利用Vogt的有关结论,给出了弱（序列式）紧正则性的特征.     

一般正则泛函的W-极小的正则性

本文讨论了一般的正则泛函：Ｆ（ｕ；Ω）＝∫_{Ωｆ（ｘ，ｕ，Ｄｕ）ｄｘ的局部Ｗ－极小的Ｃ^１，α正则性．获得了处理Ｗ－极小ｕ的Ｈ?ｌｄｅｒ连续的指数估计．}     

在π_n(x)零点上的(0,1,3)插值

本文讨论了ｎ为奇效时πｎ（ｘ）＝（１－ｘ２）Ｐ＇ｎ－１（ｘ）零点上的（０,１,３）插值的正则性及收敛性,其中Ｐｎ－１表示ｎ－１次Ｌｅｇｅｎｄｒｅ多项式．     

n维Mbius变换的正则性

本文利用高维Ｍｂｉｕｓ变换的 Ｃｌｉｆｆｏｒｄ矩阵表示,讨论了高维 Ｍｂｉｕｓ变换的正则性;证明了三维抛物Ｍｂｉｕｓ变换一定是正则的,得到了三维非抛物Ｍｂｉｕｓ变换是正则的一条充要条件;同时举例说明上述充要条件在ＳＬ（２,　ｎ）（ｎ＝２ｋ,ｋ≥２）中不成立．     

n维Mbius变换的正则性

本文利用高维Ｍｂｉｕｓ变换的 Ｃｌｉｆｆｏｒｄ矩阵表示,讨论了高维 Ｍｂｉｕｓ变换的正则性;证明了三维抛物Ｍｂｉｕｓ变换一定是正则的,得到了三维非抛物Ｍｂｉｕｓ变换是正则的一条充要条件;同时举例说明上述充要条件在ＳＬ（２,　ｎ）（ｎ＝２ｋ,ｋ≥２）中不成立．     

一般线性方法的正则性

１．引言数值方法的动力特征近年引起了人们的广泛关注。其中之一就是系统的平衡态和数值方法的平衡态相一致的问题,即用一个数值方法沿定步长求解系统时,是否会出现伪平衡。不可能出现伪平衡的方法称为是正则的。ＲＫ方法和线性多步法的正则性已被众多的文献研究［２,３,４］,其它方法的正则性显然是一亟待研究的问题。本文讨论较ＲＫ方法和线性多步法远为广泛的一般线性方法的正则性。设ｆ：Ｒ~（Ｎ）→Ｒ~（Ｎ）是一充分光滑的映射,考虑求解初值问题：的一般线性方法［１］：其中步长逼近于逼近于关于微分方程真解ｙ（ｔ）在第ｎ层…     

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.     

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.     

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.     

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     

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     

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).     

Instructions for Authors

<正>Submission Authors must use LaTeX for typewriting,and visit our website www.actamath.com to submit your paper.Our address is Editorial Office of Acta Mathematica Sinica,Academy of Mathematics and Systems Science,Chinese Academy of Sciences,Beijing 100190,P.R.China.     

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

正August 10-14,2015Beijin,China The 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