超Sober空间与k-有界Sober空间的性质北大核心

讨论了超Sober空间与k-有界Sober空间的一些性质,厘清相关拓扑之间的关系.特别地证明了一个空间是超Sober空间当且仅当其Smyth上幂空间为超Sober空间;任意一族k-有界Sober空间的积空间为k-有界Sober空间.     

超Sober空间与k-有界Sober空间的性质

讨论了超Sober空间与k-有界Sober空间的一些性质,厘清相关拓扑之间的关系.特别地证明了一个空间是超Sober空间当且仅当其Smyth上幂空间为超Sober空间;任意一族k-有界Sober空间的积空间为k-有界Sober空间.     

二次对偶空间的k-光滑性特性

深入研究了Banach空间X的二次对偶空间的k-光滑性,给出了Banach空间X的二次对偶空间为k-光滑的若干特征刻画.     

k-有界sober空间的收缩与Smyth幂空间

主要讨论k-有界sober空间对遗传、收缩、函数空间和Smyth幂构造的封闭性,证明了k-有界sober空间是饱和遗传的,但不是闭遗传的;对收缩与Smyth幂构造均不具有封闭性.还证明了存在k-有界sober空间X使得函数空间[X→X]赋予点式收敛拓扑不是k-有界sober空间.     

关于k-半层空间的一些结果

给出了对k-半层空间及c-半层空间的一些等价刻画,并给出kβ空间成为k-半层空间的一些条件.     

度量空间的序列商,k-映象

本文给出了度量空间序列商．肛映象的-些内部刻画。证明了空间X是度量空间的序列商。肛映象当且仅当X具有紧有限k-闭cs*-覆盖列的点星sn-网，当且仅当X具有紧有限k-闭覆盖列的点星网．作为上述结果的-个推论．不仅得到了空间X是度量空间序列商，k-映象当且仅当X是度量空间的k-映象，而且还证明了空间X是度量空间当且仅当X具有局部有限(紧有限)闭(肛闭)覆盖列的点星弱邻域网．这里“闭”(“k闭”)不能省略．     

Banach空间范数的k-点态粗性和k-粗性

对Banach空间范数引入了k-点态粗和k-粗的概念,利用Banach空间理论的方法,给出了x∈S(X)为范数的k-粗糙点和X的范数是k-粗的一些充分必要条件,证明了(k+1)-粗糙点是k-粗糙点以及k-粗糙点与Fréchet可微性的一些结果.特别地,在k=1的情形下蕴含了关于范数的粗糙点、点态粗范数和粗范数的相应结果.     

Quasi-Nagata空间的映射定理

本文讨论了quasi—Nagata空间与一类重要广义度量空间k—半分层空间的关系。证明了quasi—Nagata空间的一些映射性质。     

关于C-分层空间

K.B.Lee[1]引入了C-分层空间,并研究了它的一些性质,Lee的研究表明C-分层空间是一类具有较好性质的广义度量空间。C-半分层空间在度量化定理中起着重要的作用,例如,正则空间X是可度量化的当且仅当X是C-半分层、WM-空间(见[3])。在本文中,我们讨论C-分层(C-半分层,KC-半分层)空间的映射性质,给出     

Kthe-Bochner空间的凸性(英文)

本文利用Kothe函数空间的性质以及Kothe函数空间与Kothe-Bochner空间的关系,讨论了Kothe-Bochner空间E(X)的凸性,主要结果如下: (a)给出E(X)的端点的充分条件,得到了E(X)严格凸的判据,相应地推广了Lp(μ,X) 以及Lφ(X)的结果; (b)讨论了E(X)的弱局部一致凸和局部完全k-凸; (c)刻画了E(X)的强凸,给出了F(X)强凸的充要条件．     

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 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.     

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].