粗糙核分数次振荡积分算子的加权有界性

本文给出了一类带粗糙核的分数次振荡积分算子Ｔμ，Ｔμｆ（ｘ）＝∫ＲｎｅｉＰ（ｘ，ｙ）Ω（ｘ－ｙ）｜ｘ－ｙ｜ｎ－μｈ（｜ｘ－ｙ｜）ｆ（ｙ）ｄｙ的加权Ｌｐ（Ｒｎ）有界性．这里Ｐ（ｘ，ｙ）是Ｒｎ×Ｒｎ上非平凡的实多项式，Ω∈Ｌｑ（Ｓｎ－１）为零阶齐次函数，且ｈ（ｒ）∈ＢＶ（Ｒ＋）．作为推论，证明了Ｔμ和ＢＭＯ函数形成的高阶交换子Ｔμ，ｂ，Ｔμ，ｂｆ（ｘ）＝∫ＲｎｅｉＰ（ｘ，ｙ）Ω（ｘ－ｙ）｜ｘ－ｙ｜ｎ－μｈ（｜ｘ－ｙ｜）［ｂ（ｘ）－ｂ（ｙ）］ｍｆ（ｙ）ｄｙ也是加权Ｌｐ（Ｒｎ）有界的，其中ｂ（ｘ）∈ＢＭＯ（Ｒｎ），ｍ∈Ｚ＋     

带粗糙核的多线性振荡奇异积分

本文考虑多线性算子ＴＡｆ（ｘ）＝∫ＲｎｅｉＰ（ｘ，ｙ）Ω（ｘ－ｙ）｜ｘ－ｙ｜ｎ＋ｍＲｍ＋１（Ａ；ｘ，ｙ）ｆ（ｙ）ｄｙ，ｎ２，其中Ｐ（ｘ，ｙ）是Ｒｎ×Ｒｎ中的实值多项式，Ω是零次齐次函数且满足ｍ阶消失性条件，Ｒｍ＋１（Ａ；ｘ，ｙ）＝Ａ（ｘ）－｜α｜ｍＤαＡ（ｙ）（ｘ－ｙ）α，对任何｜α｜＝ｍ，ＤαＡ∈ＢＭＯ（Ｒｎ）．证明了Ω∈Ｌｑ（Ｓｎ－１）且ｑ＞１时，对任何１＜ｐ＜∞，‖ＴＡｆ‖ｐＣ（ｎ，ｍ，ｐ，ｄｅｇＰ）｜α｜＝ｍ‖ＤαＡ‖ＢＭＯ‖ｆ‖ｐ     

一个多线性振荡奇异积分算子

本文建立多线性算子ＴＡ１，Ａ２，…Ａｋｆ（ｘ）＝ｐ．ｖ∫ＲｎｅｉＰ（ｘ，ｙ）Ω（ｘ－ｙ）｜ｘ－ｙ｜ｎ＋Ｍ－ｋｋｊ＝１Ｒｍｊ（Ａｊ；ｘ，ｙ）ｆ（ｙ）ｄｙ，ｎ２，的一个变形的ｓｈａｒｐ估计，其中Ｐ（ｘ，ｙ）是Ｒｎ×Ｒｎ上的实值多项式，Ω是零阶齐性函数且满足某种消失性条件，Ｍ＝∑ｋｊ＝１ｍｊ，Ｒｍｊ（Ａｊ；ｘ，ｙ）表示Ａｊ在ｘ点关于ｙ的ｍｊ阶Ｔａｙｌｏｒ级数余项，对所有满足｜α｜＝ｍｊ－１（ｊ＝１，２，…，ｋ）的指标α，ＤαＡｊ∈ＢＭＯ（Ｒｎ）．作为ｓｈａｒｐ估计的推论，得到了算子ＴＡ１，Ａ２…Ａｋ在Ｌｐ（１＜ｐ＜∞）上的有界性．     

湖北省七市一企高三调研考试

湖北省七市一企高三调研考试一、选择题：本大题共１５小题，第（１）—（１０）题每小题４分，第（１１）—（１５）题每小题５分，共６５分，在每小题给出的四个选项中，只有一项是符合题目要求的．１．集合Ｍ＝｛ｙ｜ｙ＝ｘ２－２ｘ＋３，ｘ∈Ｒ｝，Ｎ＝｛ｙ｜ｙ＝２ｘ...     

On the Cluster Set C [S_n/(2nφ(n))~(1/2)] in 2-type Banach Space

Ｉｎｔｈｉｓｐａｐｅｒ，ｗｅｈａｖｅｏｂｔａｉｎｅｄｔｈｅｆｏｌｌｏｗｉｎｇｔｈｅｏｒｅｍｓ．Ｔｈｅｏｒｅｍ１　Ｌｅｔφ（ｘ）ｂｅａｉｎｃｒｅａｓｉｎｇｆｕｎｃｔｉｏｎｏｎ［０，＋∞），φ（ｘ）→＋∞ａｎｄφ（ｘ）ｘｂｅｎｏ－ｉｎｃｒｅａｓｉｎｇ（Ｗｈｅｎｘｉｓｌａｒｇｅｅｎｏｕｇｈ），ａｎｄｌｅｔＢｂｅａｓｅｐａｒａｂｌｅＢａｎａｃｈｓｐａｃｅ，ＸｂｅａＢ－ｖａｌｕｅｄｒａｎｄｏｍｖａｒｉａｂｌｅ，ｉｆｉ）Ｘ∈ＷＭ２０ｉｉ）Ｘτ－ＥＸτ∈ＣＬＴ，τ＞０，ｗｈｅｒｅＸτ＝ＸＩ｛ｙＸｙ≤τ｝ｉｉ…     

函数单元测试题

一、选择题１设Ｍ、Ｐ是两个非空集合,定义Ｍ与Ｐ的差集为Ｍ－Ｐ＝｛ｘ｜ｘ∈Ｍ且ｘＰ｝,则Ｍ－（Ｍ－Ｐ）等于（）．（Ａ）Ｐ（Ｂ）Ｍ∩Ｐ（Ｃ）Ｍ∪Ｐ（Ｄ）Ｍ２函数ｙ＝ｌｏｇ（２ｘ－１）３ｘ－２的定义域为（）．（Ａ）（２３,＋∞）（Ｂ）（１２,＋∞）（...     

一类多目标非线性规划广义Lagrange对偶函数的几个性质

本文对多目标非线性规划问题（ＶＰ）：ｍｉｎｆ（ｘ）ｓ．ｔ．β（ｘ）∈－Ｐ，ｘ∈Ｃ引进了一种广义的Ｌａｇｒａｎｇｅ对偶函数Ｑ（ｗ）＝ｉｎｆ｛ｆ（ｘ）＋〈ｗ，β（ｘ）〉｜ｘ∈Ｃ｝，并讨论它的性质，得到了类似文献［１］中的结果．     

一类最值互嵌问题的简捷解法

文 [1 ]探讨了最值互嵌问题 ,其中例 2涉及问题　设函数 ｆ(ｘ ,ｙ)对一切ｘ∈Ａ ,ｙ∈Ｂ有定义 ,求互嵌最值ｍｉｎｙ∈Ｂ ｍａｘｘ∈Ａｆ(ｘ ,ｙ) .通常是先确定Ｍ (ｙ) =ｍａｘｘ∈Ａ ｆ(ｘ ,ｙ)的解析式 ,再据此求最值 .但如文 [1 ]所述 ,确定Ｍ(ｙ)需经繁琐的分类讨论 ;当Ｍ (ｙ)较复杂时 ,求其最值亦非易事 .能否回避Ｍ (ｙ)而由 ｆ(ｘ ,ｙ)直接求解 ?本文提出一种有效方法 ,基于下述定理　设ａ∈Ａ ,ｂ∈Ｂ使一切ｘ∈Ａ ,ｙ∈Ｂ满足ｆ(ｘ ,ｂ)≤ｆ(ａ ,ｂ)≤ｆ(ａ ,ｙ) (1 )则函数 ｆ(ｘ ,ｙ)必有互嵌最值ｍｉｎｙ∈Ｂ ｍａｘｘ∈Ａｆ…     

一阶系统非线性边值问题的奇摄动

本文应用比较定理研究了一类非线性边界条件的向量非线性奇摄动问题εｘ＝’ｆ（ｔ，ｘ，ｙ，ｅ）εｙ’＝ｇ（ｔ，ｘ，ｙ．ε）ｘ（０）＝Ａ（ξ１．ξ２．，ｘ（１）－ｘ（０），ｙ（１）－ｙ（０），ε）ｙ（０）＝Ｂ（ξ１，ξ，ｘ（１）－ｘ（０），ｙ（１）－ｙ（０），ε）这里ξ１，ξ２为ε的函数．０＜ε〈〈１，在适当的条件下，作出了任意次精度的渐近展式．并得出余项估计．     

二维空间中半线性波动方程的Goursat问题

本文讨论Ｇｏｕｒｓａｔ问题：｛□ｕ≡ｕｔｔ－ｕｘｘ－ｕｙｙ＝Ｆ（ｔ，ｘ，ｙ，ｕ），（ｔ，ｘ，ｙ）∈Γ：ｘ＾２＋ｙ＾２〈ｔｕ│эΓ＝０设Ｆ（ｔ，ｘ，ｙ，ｕ）关于各个变量充分光滑。以光维Γ内的完备切边算子系ｔээｘ＋ｘээｘ＋ｙээｙ，ｔээｘ＋ｘээｔ，ｔээｙ＋ｙээｔ，ｘээｙ－ｙээｘ为生成元所生成的切向量场记为Ｚ，由Ｚ构造余法型空间Ｉ＾ｋ，１。将线性Ｇｏｕｒｓａｔ问题转化成Ｃａｕｃｈｙ问题，     

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.