解一类抽象积—微分方程的积分半群方法

在这篇文章内，研究一类含参数线性一算子族Ａ（ｔ）和线性算子Ｂ的积－微分方程，应用积分半群方法证明了该方程存在指数有界解，和含Ａ（ｔ），Ｂ的二阶微分方程存在指数有界和分解。这里Ａ（ｔ），Ｂ不必满足Ｈｉｌｌｅ－Ｙｏｓｉｄａ条件。     

Sierpinski gasket上Brown运动的重点

设（Ｘ（ｔ），ｔ≥０）为Ｓｉｅｒｐｉｎｓｋｉ ｇａｓｋｅｔ上的Ｂｒｏｗｎ运动，Ｅ为（０，＋∞）中闭子集，本文考虑了何时Ｘ（Ｅ）具有Ｋ重点，给出了一个充分条件和一个必要条件。     

Average Widths of Multivariate Besov Class S_(pθ)_rB(R~d)in L_q(R~d)

ＡｖｅｒａｇｅＷｉｄｔｈｓｏｆＭｕｌｔｉｖａｒｉａｔｅＢｅｓｏｖＣｌａｓＳｒｐθＢ（Ｒｄ）ｉｎＬｑ（Ｒｄ）ＪｉａｎｇＹａｎｊｉｅ（蒋艳杰）（Ｄｅｐｔ．ｏｆＭａｔｈ．，ＢｅｉｊｉｎｇＮｏｒｍａｌＵｎｉｖｅｒｓｉｔｙ，Ｂｅｉｊｉｎｇ，１００８７５）ＭＲ（...     

Average Widths and Optimal Recovery of Multivariate Besov Class B_(pθ)~r(R~d)in L_(qp)(R~d)

ＡｖｅｒａｇｅＷｉｄｔｈｓａｎｄＯｐｔｉｍａｌＲｅｃｏｖｅｒｙｏｆＭｕｌｔｉｖａｒｉａｔｅＢｅｓｏｖＣｌａｓＢｒｐθ（Ｒｄ）ｉｎＬｑｐ（Ｒｄ）＊）ＪｉａｎｇＹａｎｊｉｅ（蒋艳杰）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＢｅｉｊｉｎｇＮｏｒｍ...     

闭逐块光滑流形上的Cauchy－Fantappie型积分的边界性质

对Ｃ￣ｎ空间中具有逐块Ｃ￣（１）光滑可定向边界Ｄ的有界域Ｄ和著名的Ｃａｕｃｈｙ－Ｆａｎｔａｐｐｉｅ公式，本文定义一类与Ｂｏｃｈｎｅｒ－Ｍａｒｔｉｎｅｌｌｉ核同伦等价的Ｃ－Ｆ核Ω，应用同伦方法证明具有Ｈｏｌｄｅｒ密度的相应奇异积分Ｆ（ｔ）存在哥西主值和Ｃ－Ｆ型积分Ｆ（ｚ）存在满足Ｈｏｌｄｅｒ条件的内、外极限值Ｆ￣＋（ｔ）和Ｆ￣－（ｔ）；同时建立一个更一般的含有边界上点ｔ的立体角系数α（ｔ）的Ｐｌｅｍｅｌｊ公式。     

闭逐块光滑流形上的Cauchy—Fantanppie型积分的边界性质

对Ｃ＾ｎ空间中具有逐块Ｃ＾（１）光滑可定向边界δＤ的有界域Ｄ和著名的Ｃａｕｃｈｙ－Ｆａｎｔａｐｐｉｅ公式，本文定义一类与Ｂｏｃｈｎｅｒ－ｍａｒｔｉｎｅｌｌｉ核同伦等价的Ｃ－Ｆ核Ω，应用同伦方法证明具有Ｈｏｌｄｅｒ密度的相应奇异积分Ｆ（ｔ）存在哥西主值和Ｃ－Ｆ型积分Ｆ（ｚ）存在满足Ｈｏｌｄｅｒ条件的内，外极限值Ｆ＾＋（ｔ）和Ｆ＾－（ｔ）；同时建立一个更一般的含有边界上点ｔ的立体角系数α（ｔ）的Ｐｌｅ     

非定常概周期系统局部结构稳定的充要条件

本文给出：如果一致概周期函数ｆ（ｔ，ｘ）满足：ｉ）ｆ（ｔ，０）＝０；ｉｉ）Ｄｘｆ（ｔ，ｘ）在Ｒ×Ｄ上有界（Ｄ是Ｒｎ中含原点的一个区域）；ｉｉｉ）对ｔ一致成立，那么系统关于Ｂ１（所有满足ｉ），ｉｉ）的一致概周期函数全体所成之集按范数构成的赋范线性空间）在原点邻域局部结构稳定的充要条件是它的零解变分系统在Ｒ上具有指数型二分性．进而得到系统关于Ｂ１在原点邻域局部结构稳定是可继承的．并推出这类结构稳定的系统在Ｂ１的某子空间中是处处稠密的．     

没有附加随机有界条件的B值随机元列的有界重对数律

没有附加随机有界条件的Ｂ值随机元列的有界重对数律刘立新，杨小云（保定师范专科学校，保定０７１０５１）（吉林大学数学系，长春１３００２３）ＢＯＵＮＤＥＤＬＡＷＯＦＴＨＥＩＴＥＲＡＴＥＤＬＯＧＡＲＩＴＨＭＦＯＲＡＳＥＱＵＥＮＣＥＯＦＢ－ＶＡＬＵＥＤＲＡＮ...     

Brown运动关于球的末遇时道出时及停留时的矩

设Ｘ＝（Ｘｔ）ｔ≥０为Ｒ＾ｄ中的标准Ｂｒｏｗｎ运动,Ｂｒ＝（ｘ：ｘ∈Ｒ＾ｄ,／ｘ／〈ｒ）为以原点中心,半径ｒ的球,分别用Ｌｒ,Ｔｒ及Ｔｒ表示Ｘ末遇Ｂｒ,首出Ｂｒ及停留在Ｂｒ中的时间,本文给出了求这些变量的矩的一般公式,并求出了前二阶矩。     

关于Poincaré度量与Bers逼近定理

本文首先给出区域Ｄ的Ｐｏｉｎｃａｒé度量λ（ｚ）的几个有关性质，然后推广Ｂｅｒｓ逼近定理，得到主要结果如下：设Ｄ是连通数为有穷的有界区域，记Ａｑ（Ｄ）为Ｄ内满足｜｜ｐ｜｜＝∫∫＿Ｄ［λ（ｚ）￣（２－９）｜ψ（ｚ）｜｜ｄｚ∧ｄｚ＜∞的解析函数ψ之全体构成的Ｂａｎａｃｈ空间（其中整数ｑ≥２），Ｒｑ（Ｄ，Ｔ）（ＴＣ（ｃ－Ｄ））表示Ａｑ（Ｄ）中极点在Ｔ的有理函数子空间，当Ｔ满足Ｂｅｒｓ逼近定理条件时，Ｒｑ（Ｄ，Ｔ）在Ａｑ（Ｄ）中稠密。     

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.     

On a class of self-similar processes with stationary increments in higher order Wiener chaoses

We study a class of self-similar processes with stationary increments belonging to higher order Wiener chaoses which are similar to Hermite processes. We obtain an almost sure wavelet-like expansion of these processes. This allows us to compute the pointwise and local Hölder regularity of sample paths and to analyse their behaviour at infinity. We also provide some results on the Hausdorff dimension of the range and graphs of multidimensional anisotropic self-similar processes with stationary increments defined by multiple Wiener–Itô integrals.     

A REPRESENTATION FORMULA RELATED TO SCHR(O)DINGER OPERATORS

Schr(o)dinger operator is a central subject in the mathematical study of quantum mechanics.Consider the Schrodinger operator H = -△ V on R, where △ = d2/dx2 and the potential function V is real valued. In Fourier analysis, it is well-known that a square integrable function admits an expansion with exponentials as eigenfunctions of -△. A natural conjecture is that an L2 function admits a similar expansion in terms of "eigenfunctions" of H, a perturbation of the Laplacian (see [7], Ch. Ⅺ and the notes), under certain condition on V.     

On a class of Riemann surfaces

It is considered the class of Riemann surfaces with dimT1 = 0, where T1 is a subclass of exact harmonic forms which is one of the factors in the orthogonal decomposition of the spaceΩH of harmonic forms of the surface, namely The surfaces in the class OHD and the class of planar surfaces satisfy dimT1 = 0. A.Pfluger posed the question whether there might exist other surfaces outside those two classes. Here it is shown that in the case of finite genus g, we should look for a surface S with dimT1 = 0 among the surfaces of the form Sg\K , where Sg is a closed surface of genus g and K a compact set of positive harmonic measure with perfect components and very irregular boundary.     

CONTENTS OF VOLUME 30

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Instructions for contributions

正Applied Mathematics-A Journal of Chinese Universities,Series B(Appl.Math.J.Chinese Univ.,Ser.B)is a comprehensive applied mathematics journal jointly sponsored by Zhejiang University,China Society for Industrial and Applied Mathematics,and Springer-Verlag.It is a quarterly journal with     

Journal of Mathematical Research with Applications Guide for Authors

正Journal overview:Journal of Mathematical Research with Applications(JMRA),formerly Journal of Mathematical Research and Exposition(JMRE)created in 1981,one of the transactions of China Society for Industrial and Applied Mathematics,is a home for original research papers of the highest quality in all areas of mathematics with applications.The target audience comprises:pure and applied mathematicians,graduate students in broad fields of sciences and technology,scientists and engineers interested in mathematics.     

Staircase transportation problems with superadditive rewards and cumulative capacities

A cumulative-capacitated transportation problem is studied. The supply nodes and demand nodes are each chains. Shipments from a supply node to a demand node are possible only if the pair lies in a sublattice, or equivalently, in a staircase disjoint union of rectangles, of the product of the two chains. There are (lattice) superadditive upper bounds on the cumulative flows in all leading subrectangles of each rectangle. It is shown that there is a greatest cumulative flow formed by the natural generalization of the South-West Corner Rule that respects cumulative-flow capacities; it has maximum reward when the rewards are (lattice) superadditive; it is integer if the supplies, demands and capacities are integer; and it can be calculated myopically in linear time. The result is specialized to earlier work of Hoeffding (1940), Fréchet (1951), Lorentz (1953), Hoffman (1963) and Barnes and Hoffman (1985). Applications are given to extreme constrained bivariate distributions, optimal distribution with limited one-way product substitution and, generalizing results of Derman and Klein (1958), optimal sales with age-dependent rewards and capacities.To our friend, Philip Wolfe, with admiration and affection, on the occasion of his 65th birthday.Research was supported respectively by the IBM T.J. Watson and IBM Almaden Research Centers and is a minor revision of the IBM Research Report [6].     

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.