世界数学家大会(2002)卫星会议会讯

International Congress of Mathematical Software. Beijing. Aug. 1719.Contast:xgao@mmrc. iss. ac. cn; zliu@mmrc. iss. ac. ca. Wibsite: http: / /www. mathsoftware.org/Operator Algebras and Applications. Chengde. Aug.14-18.Contact: chengde@O AinChina. org; hxlin@cartan. uoregon. edu. Website: http: / /www. O AinChina. orgDifferential Geometry and Global Analysis. Tianjin. Aug.17-18.Contact: weiping@sun. nankai .edu. cnMathematical Biology Guilin. Aug.15-18.Contact: gxnu@public. glptt. …     

多变点过程的随机控制

用鞅论方法来研究多变点过程及其随机控制已引起人们注意。P.Bremaud在这方面作了许多工作.A.F.Martins-Neto与E.Wong用鞅论方法研究了排队问题.R.Boel与 P.P.Varaiya在 1977年的一篇文章中讨论了一个较为一般的跳过程最优控制模型.M.H.A.Davis与R.J.Elliott对[3]的工作作了改进,建立了跳过程最优控制的极小值原理.R.Rishel,S.R.Pliska等人用不同的方法得到类似结果.     

2006年浙江省台州市中考数学试卷

一、选择题(有12小题,每小题4分,共48分)第2题图1.下列各数中是正整数的是()A.-2B.1C.0.3D.22.如图,长方体的面有()A.4个B.5个C.6个D.7个3.下列计算正确的是()A.3x-2x=1B.3x 2x=5x2C.3x·2x=6xD.3x-2x=x4.直径所对的圆周角是()A.锐角B.直角C.钝角D.无法确定第5题图5.如图,圆锥的母线长为5cm,底面半径为3cm,则此圆锥的高线长为()A.4cm B.5cmC.3cm D.8cm6.方程x2-4x 3=0的两根之积为()A.4B.-4C.3D.-37.要使根式x-3有意义,则字母x的取值范围是()A.x≥3B.x>3C.x≤3D.x≠38.若反比例函数y=xk的图象经过(-2,1),则k的值为()A.-2B.2C.-…     

D.C.隶属函数模糊集及其应用(I)--D.C.隶属函数模糊集基本概念与性质

本文是D.C.隶属函数模糊集及其应用系列研究的第一部分.建立了D.C.隶属函数模糊集的基本概念.探讨了D.C.隶属函数模糊集的基本性质和D.C.隶属函数模糊集对一些常见的重要t模、余模和伪补的封闭性.并以此建立了丰富的模糊数学应用模型.     

2003年中考数学模拟试题(1)

一、选择题 (本大题满分 3 6分 ,每小题各 3分 )1 .-2的相反数的倒数是 (　 ) .Ａ . 2　　Ｂ .22 　　Ｃ .-22 　　Ｄ .22 .计算 (ｘ2 ) 3÷ (ｘ3) 2 的结果是 (　 ) .Ａ .0　　Ｂ .-ｘ　　Ｃ .ｘ　　Ｄ .13 .下列各式中 ,正确的是 (　 ) .Ａ . 2 5 =± 5　　　Ｂ . ( -3 ) 2 =-3Ｃ .ａ3+ａ3=ａ6 　　　Ｄ .|-2 |=-( -2 )4.函数 ｙ =ｘ2 -ｘ,自变量ｘ的取值范围是(　 ) .Ａ .ｘ≠ 3且ｘ≠ 0　　　Ｂ .ｘ <3且ｘ≠ 0Ｃ .ｘ≤ 3Ｄ .ｘ <35 .不等式组 ｘ +5 <0-ｘ >2 的解集为 (　 ) .Ａ .ｘ <-5　Ｂ .ｘ <-2Ｃ .-5 <ｘ <-2　Ｄ .空集6.在等边…     

高考专题复习系列讲座——极限、导数、复数

[考试内容和考试要求]1.考试内容极限:数学归纳法.数学归纳法的应用.数列的极限.函数的极限.根限的四则运算.函数的连续性.导数:导数的概念.导数的几何意义.几种常见函数的导数.两个函数的和、差、积、商的导数.复合函数的导数.基本导数公式.利用导数研究函数的单调性和极值.函     

初二代数第二学期期中自测题

Ａ组一、选择题 (每小题 3分 ,共 3 0分 )1 . ( - 2 ) 2 平方根是 (　 ) .Ａ . - 1 .4 2　　　Ｂ .± 1 .4 2Ｃ . - 2　　　　Ｄ .± 22 .下列各式求值正确的是 (　 ) .Ａ . 3 2 =± 3　　　　Ｂ .± ( - 4) 2 =± 4Ｃ . - ( - 4) 2 =4Ｄ . ( - 3 ) 2 =- 33 .使式子 -ｘ2 有意义的ｘ是 (　 ) .Ａ .全体正数　　　　Ｂ .全体负数Ｃ .零Ｄ .非零数4 .一个自然数的算术平方根是ｘ ,则下一个自然数的算术平方根是 (　 ) .Ａ .ｘ + 1　　　　　Ｂ .ｘ2 + 1Ｃ .ｘ + 1Ｄ .ｘ2 + 15. 1的 2ｎ(ｎ为任意正整数 )次方根为 (　 ) .Ａ . 1　　Ｂ . - 1　…     

2006年重庆市初中学业考试数学试卷

一、选择题:1.3的倒数是()A.-3B.3C.31D.-312.计算2x2·(-3x3)的结果是()A.-6x5B.6x5C.-2x6D.2x63.⊙O的半径为4,圆心O到直线l的距离为3,则直线l与⊙O的位置关系是()A.相交B.相切C.相离D.无法确定4.使分式2xx-4有意义的x的取值范围是()A.x=2B.x≠2C.x=-2D.x≠-25.不等式组xx--23><00的解集是()6.A如.图x,>⊙2O的B.直x径<3CDC过.弦2相似文献   

巧求概率

，.人下.‘.，.直.，.‘.，.‘.，.玉甲. 12个排球队中有两个强队，将这12个队分成两组(每组6个队)，求这两个强队被分在一个组内的概率.五，..口，.二甲.人丫-盛，.‘.，解两个强队分别简称A、B，若强队A的编组已定，则与A同组的空位有5个，与A不同组的空位有6个.将B填入这n个     

2005年北京市中考数学试卷

一、选择题(共44分,每题4分)1.-2的相反数是()A.-12B.21C.2D.-22.下列运算中,正确的是()A.4=2B.2-3=-6C.(ab)2=ab2D.3a 2a=5a23.下列根式中,与3是同类二次根式的是()A.24B.12C.23D.184.下列图形中,不是中心称图形的是()A.圆B.菱形C.矩形D.等边三角形5.据国家环保总局通报,北京市是“十五”水污染防治计划完成最好的城市.预计今年年底,北京污水处理能力可以达到每日1684000吨.将1684000吨用科学记数法表示为()A.1.684×106吨B.1.684×105吨C.0.1684×107吨D.16.84×105吨6.如图,在半径为5的⊙O中,如果弦AB的长为8,那么它的弦心距OC…     

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).     

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.     

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.