拟Raabe判别法与拟对数判别法的强弱关系

拟Raabe判别法是新近提出的关于正项级数收敛性的一种比较细致的判别法.对通项递减的正项级数来说,此判别法强于传统的Raabe判别法与Gauss判别法.通过对拟Raabe判别法与另一个细致的判别法——拟对数判别法强弱关系的探讨,得出了后一判别法强于前者的结论.     

包络排除方法及奇解排除定理

讨论包络和奇解的判断问题,通过分析c-判别曲线上切线斜率的存在性,明确p-判别曲线中p的含义,得出通解曲线族中的曲线只有在c-判别曲线上每一点处存在切线斜率时,c-判别曲线才有可能是包络,否则c-判别曲线必定不是包络,另外在求奇解时,p-判别曲线中的p必须等于p-判别曲线的斜率,否则p-判别曲线必定不是奇解.     

对一些正项级数判别法的一种统一表述

某些常见的重要的正项级数判别法可以进行统一表述,得到的同一表达形式,可用以比较现有多种正项级数判别法的不同精密度。可以认为,该判别法包含了目前常见的正项级数收敛性的判别法,其它判别法只是该判别法的特殊情况。     

正项级数的Raabe对数判别法

在正项级数敛散性Raabe判别法和第一对数判别法的基础上,以P-级数作为比较标准,讨论了第二对数判别法,并且证明了Raabe判别法和第二对数判别法的等价性.     

无穷级数中高斯判别法的进一步讨论

经过计算和逻辑推理,提出两种判别范围较大的正项级数判敛法,即广义高斯判别法及广义拟对数判别法,并对这两个判别法进行了比较.     

基于P级数判敛的正项级数敛散性判别方法

借助由比较判别法导出的引理,证明了一种形式类同比值判别法的新的判别方法。     

关于Cauchy—D‘Alembert判别法

直接使用Cauchy判别法或者D'alembert判别法来判别数项级数的敛散性时,有时计算极限难度大.为了计算极限简单,本文提出灵活使用Cauchy判别法和D'alembert判别法的方法.     

正项级数敛散性的一个判别法

基于正项级数的比较判别法和p-级数的敛散性,给出一个与D’Alembert判别法和Cauchy判别法平行的判别正项级数敛散性的方法.并通过实例对所给判别法的可行性进行检验,发现它是已有方法的一个有效补充.     

仿射框架的新准则

仿射框架是小波理论中很基本的概念.熟知的关于仿射框架的Daubechies判别法引用了由绝对值| (ajω) (ajω lT)|算出的量来作判别.在本文建立的新判别法中引用了由(ajω) (ajω lT)的适当组合的代数和算出的量来作判别.当为偶函数时,新的判别法优于Daubechies判别法.     

Cauchy判别法的推广

以正项级数的比较判别法为基础,得到判别正项级数敛散性的两个判别方法,它可以作为Cauchy判别法对正项级数∑u_n,(u_n0),ρ=(?)u_n~(n/1)当ρ=1失效时的一个补充,把它称为Cauchy判别法的推广.     

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.     

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].     

Laminations minimales résiduellement à 2 bouts

Résumé On décrit toutes les feuilles des laminations minimales dont un ensemble résiduel de feuilles ont 2 bouts.      

Best approximation by downward sets with applications

We develop a theory of downward sets for a class of normed ordered spaces. We study best approximation in a normed ordered space X by elements of downward sets, and give necessary and sufficient conditions for any element of best approximation by a closed downward subset of X. We also characterize strictly downward subsets of X, and prove that a downward subset of X is strictly downward if and only if each its boundary point is Chebyshev. The results obtained are used for examination of some Chebyshev pairs （W,x）, where ∈ X and W is a closed downward subset of X     

Boundedness of multilinear operators on weighted herz type spaces

In this paper, the author establishes the boundedness of multilinear operators on weighted Herz spaces and Herz-type Hardy spaces. The author also obtains their weak estimates on endpoints. As a special case, the conclusions may lead to the weighted estimates for multilinear Calderon-Zygmund operators.     

THE EXACT CONVERGENCE RATE AT ZERO OF LAGRANGE INTERPOLATION POLYNOMIAL TO |x|α

In this paper we present a generalized quantitative version of a result due to M. Revers concerning the exact convergence rate at zero of Lagrange interpolation polynomial to f(x) = |x|α with on equally spaced nodes in [-1, 1].