OSCILLATING MULTIPLIERS ON NONCOMPACT RIEMANNIAN SYMMETRIC SPACE SL（3,IH）／Sp（3）

ＯＳＣＩＬＬＡＴＩＮＧＭＵＬＴＩＰＬＩＥＲＳＯＮＮＯＮＣＯＭＰＡＣＴＲＩＥＭＡＮＮＩＡＮＳＹＭＭＥＴＲＩＣＳＰＡＣＥＳＬ（３，ＩＨ）／Ｓｐ（３）ＺＨＵＦＵＬＩＵＭａｎｕｓｃｒｉｐｔｒｅｃｅｉｖｅｄＪｕｌｙ２８，１９９５．ＲｅｖｉｓｅｄＡｐｒｉｌ...     

Heisenberg群上热核及Green核的渐近性

本文讨论Heisenberg群上热核及Green核的渐近性，给出了当群中元素靠近中心和远离中心时的渐近行为     

正规实型对称空间上平方函数算子的弱1——1有界性

利用正规实型对称空间上热核的一个上界估计及非紧致Riemann对称空间上热核 的一个梯度估计,证明了正规实型对称空间上的Littlewood-Paley平方函数算子的弱1-1 有界性.     

THE HEAT KERNEL ON THE CAYLEY HEISENBERG GROUP

1IntroductionThe aim of the present paper is to construct an explicit expression of an heat kernel forthe Cayley Heisenberg group of order n.Hulanicki[1]and Gaveau[2]constructed the explicit expression of the heat kernel for theHeisenberg group by using p…     

非紧致一秩对称空间上某种极大函数的可和性

ＮｏěｌＬｏｈｏｕé证明了复对称空间上某种极大函数ｆ＋（ｘ）＝ｓｕｐｔ＞０（１＋ｔ）３２｜Ｐｔｆ（ｘ）｜的可和性可归结为‖（Δ０）１２ｆ‖（ｘ）的可和性．作者证明了上述结果对奇数维实双曲空间成立．由于偶数维实双曲空间的热核表达式不同，因此有必要对偶数维实双曲空间的情形单独给出证明．本文的目的就是证明上述结果对偶数维实双曲空间亦成立．     

SOBOLEV INEQUALITY ON RIEMANNIAN MANIFOLDS

Let M be an n dimensional complete Riemannian manifold satisfying the doubling volume property and an on-diagonal heat kernel estimate. The necessary-sufficient condition for the Sobolev inequality ||f||q ≤Cn,,v,p,q(||(?)f||p ||f||p) (2 ≤p < q < ∞) is given.     

一个二进小波变换像空间的再生核函数

1 引言 小波分析是结合泛函分析、应用数学、逼近论、调和分析、广义函数论等数学知识的结晶,具有深刻的理论意义和广泛的应用范围,被称为”数学显微镜”.基于其多分辨分析的特点以及在时、频两域都具有表征信号局部特征的功能,应用它可以解决许多Fourier变换不能解决的难题,为工程应用提供了一种新的、更有效的分析工具[1],由...     

THE NUMERICAL METHODS FOR SOLVING EULER SYSTEM OF EQUATIONS IN REPRODUCING KERNEL SPACE H~2(R)

1. IntroductionIn recede years, more and more people are interested in solving Euler system of equations.They presented various methods to simulate the flow of the complicated fluid field. It is wellknown that Euler system of equations has described many practical engineering problems, suchas spherically symmetric flow, the flow inside a pipe, whose sectional area changed slowly, theradius of curvature is large, sectional area is small and so on. And it not only describes theincompressible id…     

THE SINE TRANSFORM OPERATOR IN THE BANACH SPACE OF SYMMETRIC MATRICES AND ITS APPLICATION IN IMAGE RESTORATION

In this paper, we study an operator s which maps every n-by-n symmetric matrix A, to a matrix s(A_n) that minimizes || B_n-A_n || F over the set of all matrices B_n, that can be diagonalized by the sine transform. The matrix s(A_n), called the optimal sine transform preconditioner, is defined for any n-by-n symmetric matrices A_n. The cost of constructing s(A_n) is the same as that of optimal circulant preconditioner c(A_n) which is defined in [8], The s(A_n) has been proved in [6] to be a good preconditioner in solving symmetric Toeplitz systems with the preconditioned conjugate gradient (PCG) method. In this paper, we discuss the algebraic and geometric properties of the operator s, and compute its operator norms in Banach spaces of symmetric matrices. Some numerical tests and an application in image restoration are also given.     

Journe小波变换像空间描述

1引言1950年N.Aronszjan发表的一篇综述性文章《Theory of reproducing kernels》标志再生核理论的初步形成.由于再生核有许多良好的计算性质,S.Saitoh总结并深入研究再生核基本理论,进一步拓展了再生核的应用领域;徐利治把再生核应用于L~2(B)(B是复平面上的一个区域)中解析函数重积分降维问题,并提出了一个能对一些预先给出的     

关于回归函数核估计的叠对数律

讨论了非参数回归函数的核估计，用核估计误差分解方法，较弱条件下，到了回归函数核估计的叠对数值。     

Radon变换的一些估计结果

本文得到Radon变换的一些先验不等式结果；当视Radon变换为函数空间L^P(p≤2)到带混合范数的Lebesgue空间的算子时，本文还建立了一些估计式并把投影切片定理推广到更一般函数类。     

具周期性的含卷积核与余割核混合的积分方程

运用所给出的引理及离散的Fourier变换, 在$L_2[-\pi, \pi]$上讨论了一类具周期性的含卷积核与余割核$\csc(\tau-\theta)$混合的奇异积分方程,把此类方程转化为离散跃度问题, 得到了方程的可解条件和一般解的显式.     

論黎曼測度V_m在常曲率空間S_(m+1)中的變形

<正> 在歐氏空間E_(m+1)中的安裝及變形問題在近一世紀的幾何學者的工作中得到了解决,而所確定的V_m E_(m+1)一般是不能變形的。就是說,能够變形的只是狹窄的一類超曲面.運用了外微分形式的方法,很詳細地綜合了這些工作,並且完全地給出     

VALUE-AT-RISK的核估计理论

如何根据历史数据估计Value-at-Risk（VaR）;是风险分析与管理中一个重要的基本问题.木文基于非参数核估计方法,通过拟合实际数据过程的分布,构造了VaR的估计.在合适的相依数据条件下,证明了该估计量的渐近正态性,并给出了渐近方差的估计.由此表明:本文所构造的估计量不仅比参数模型具有更广泛的适应性,而且如同参数模型具有n~（-1/2）的收敛速度.本文假设的数据过程避免使用混合性,可很好地适用于金融管理中广泛应用的ARMA与GARCH模型族及非线性模型.     

回归函数核估计的随机加权法

本文利用随机加权法的思想,构造了回归函数g(x)的核估计     

ON THE CONSTRUCTIONS OFPRE-WAVELETS IN L_2(R~s)

1.IntroductionForagivensetacgLZ:=LZ(R')wedenotebyS(di)theLZ-closureofallfinitecombinationsofmulti-integeraEZ'translationsofallofE4.Asequenceofclosedsubspaces{Vk}k.zgLZformsamultiresolutionanalysisofLZifitsatisfiesthefollowingconditions:(iii)f6Vk~scf.=f(2.)EVk l,kEZ,fEVO~f('~or)EVO,or6Z";(tv)ThereisafunctionyiEVO,calledscalefunction,suchthat(W'--or))....isaRieszbasisforfo,i.e.,VO=S(W)andMIJIdll5lid*all5MZlldllwith0相似文献   

ON THE UPPER ESTIMATES OF FUNDAMENTAL SOLUTIONS OF PARABOLIC EQUATIONS ON RIEMANNIAN MANIFOLDS

ＯＮＴＨＥＵＰＰＥＲＥＳＴＩＭＡＴＥＳＯＦＦＵＮＤＡＭＥＮＴＡＬＳＯＬＵＴＩＯＮＳＯＦＰＡＲＡＢＯＬＩＣＥＱＵＡＴＩＯＮＳＯＮＲＩＥＭＡＮＮＩＡＮＭＡＮＩＦＯＬＤＳ￥ＬＩＪＩＡＹＵ；ＳＨＡＯＸＩＮ（ＤｅｐａｒｔｍｅｌｌｔｏｆＭａｔｈｅｍａｔｉｃｓ，Ａ...     

THE PERMUTATION FORMULA OF SINGULAR INTEGRALS WITH BOCHNER-MARTINELLI KERNEL ON STEIN MANIFOLDS

Using the method of localization, the authors obtain the permutation formula of singular integrals with Bochner-Martinelli kernel for a relative compact domain with C(1) smooth boundary on a Stein manifold. As an application the authors discuss the regularization problem for linear singular integral equations with Bochner-Martinelli kernel and variable coefficients; using permutation formula, the singular integral equation can be reduced to a fredholm equation.