Dedekind和及第一类Chebyshev多项式

本文利用分析方法、Dedekind和及第一类Chebyshev多项式的算术性质,研究了一类关于Dedekind和及第一类Chebyshev多项式混合均值的渐近估计问题,并得到了一个较强的渐近公式.     

三对角行列式与Chebyshev多项式

给出了三对角行列式的几种算法,利用三对角行列式证明了两类Chebyshev多项式的几种显式.     

第二类Chebyshev多项式系数的绝对值和的卷积

本文主要的目的是利用广义Fibonacci多项式的生成函数及其偏导数来研究第二类Cheby-shev多项式卷积的计算,并给出—个有趣的计算公式.     

基于第二类Chebyshev多项式的导函数的双正交级数

本文基于第二类Ｃｈｅｂｙｓｈｅｖ多项式，构造双正交级数，给出其核函数的Ｃｈｒｉｓｔｏｆｆｅｌ－Ｄａｒｂｏｕｘ型公式，讨论其部分和与相应的Ｆｏｕｒｉｅｒ级数的部分和之间的关系，导出了部分和的偏差估计．     

一些包含Chebyshev多项式和Stirling数的恒等式

利用初等方法研究Chebyshev多项式的性质,建立了广义第二类Chebyshev多项式的一个显明公式,并得到了一些包含第一类Chebyshev多项式,第一类Stirling数和Lucas数的恒等式.     

基于第二类Chebyshev多项式零点的Pal-型插值多项式的逼近

设{x_k}_(k-0)~n是n 1次多项式U_n(x)=(1-x~2)U_n(x)的零点,其中U_n(x)是第二类Chebyshev多项式。设是的零点。根据Pal的插值理论,对函数f∈C~1[-1,1],存在唯一的2n 1次多项式满足条件: 本文研究用Pal型插值多项式对函数f∈C~r[-1,1](r≥1)和它的导函数的逼近。     

正则树的双变量色多项式研究

最近Klaus Dohmen等人提出新的双变量色多项式概念,对此,本文提出—个—般性的减边公式.通过反复运用该公式,可以方便求得任何简单图的双变量色多项式.由此减边公式,研究了一些特殊图和多分支图的双变量色多项式公式.本文还研究了由互不相连的多个子图都与某个顶点相连而成的图的双变量色多项式计算的删点公式以及简单图的双变量色多项式系数和问题.进而,本文提出—个新概念—正则树.利用这个减边公式,研究了正则树的双变量色多项式计算公式和—些性质,以及正则树整子图的双变量色多项式公式及其有关性质.     

基于Chebyshev多项式的神经网络中长期负荷预测研究

高精度负荷预测在提高电力系统的安全性和经济性方面有着极其重要的意义,而现有的负荷预测方法因参数有限,难以完全反映其内在规律,因而导致预测结果不够准确.为此提出了一种基于Chebyshev多项式神经网络模型的预测方法.该方法使用递推最小二乘法训练神经网络权值系数,以获得高精度的参数估计,从而实现Chebyshev多项式神经网络模型对负荷量的最优拟合,再利用训练好的Chebyshev多项式神经网络模型实现中长期负荷预测.研究结果表明,该方法能较好模拟负荷变化规律,有效提高了负荷预测精度,在电力系统负荷预测中有较大的应用价值.     

层次分析中广义最小偏差法的性质

广义最小偏差法（GLDM）是层次分析中一种重要的排序方法．本文讨论了广义最小偏差法的性质和灵敏度分析问题．     

双变量部分theta函数的乘积公式与性质

本文研究一类新的双变量部分theta函数,它是经典部分theta函数的推广,主要围绕这类函数的乘积公式、递推关系、级数展开等性质展开讨论.作为主要结果,我们建立了任意两个双变量部分theta函数的乘积公式,推广了Andrews-Warnaar经典部分theta函数的乘积公式,发现了双变量部分theta函数所满足的二阶递...     

计算几何中几何偏微分方程的构造

平均曲率流、曲面扩散流和Willmore流等著名的几何流除了在理论方面有重要的意义之外,在计算机辅助几何设计、计算机图形学以及图像处理等领域也得到了广泛的应用．然而在解决实际问题时,人们经常要根据问题的特点构造其它具有指定性质的几何流．本文从统一的观点出发,对于参数曲面以及水平集曲面,给出了几类重要几何偏微分方程(包括L2梯度流、H-1梯度流以及H-2梯度流)的构造．这几类几何流的包容十分广泛,上述提到的几个几何流均为其特例．     

一阶拟线性偏微分方程组局部几何解的实现定理

用奇点理论研究一阶拟线性偏微分方程组,得到局部几何解的实现定理等结果.     

广义m阶Bernoulli数和广义m阶Euler数的计算公式

使用发生函数方法,利用第一类Stirling数和第二类Stirling数分别给出广义m阶Bernoulli数和广义m阶Euler数的计算公式.     

AN ANALOGUE OF A THEOREM OF FERENC LUKÁCS FOR DOUBLE WALSH—FOURIER SERIES

A theorem of Ferenc Lukács states that if a periodic function is integrable in Lebesgue"s sense and has a discontinuity of first kind at some point , then the th partial sum of the conjugate series to its trigonometric Fourier series at divided by converges to as . An analogue of this theorem for Walsh–Fourier series was proved by Rafat Riad. The main aim of the present paper is to extend the latter result from single to double Wals–Fourier series. We consider also functions of two variables which are of bounded variation over a rectangle in the sense of Hardy and Krause. Among others, we present a proof of the existence of the so-called sector limits of such functions at each point.     

Explicit Evaluation of Euler and Related Sums

Ever since the time of Euler, the so-called Euler sums have been evaluated in many different ways. We give here a (presumably) new proof of the classical Euler sum. We show that several interesting analogues of the Euler sums can be evaluated by systematically analyzing some known summation formulas involving hypergeometric series. Many other identities related to the Euler sums are also presented. Research of the first author was supported by Korea Science and Engineering Foundation Grant R05-2003-10441-0. Research of the second author was supported by the Natural Sciences and Engineering Research Council of Canada Grant OGP0007353. 2000 Mathematics Subject Classification: Primary–11M06, 33B15, 33E20; Secondary–11M35, 11M41, 33C20     

Polynomials of Least Deviation from Zero

A new family of polynomials of least deviation from zero is defined on the unit disk B. Lower bounds for best approximations in the space L _p (B), p ≥ 1, are given.__________Translated from Matematicheskie Zametki, vol. 78, no. 2, 2005, pp. 308–313.Original Russian Text Copyright © 2005 by V. A. Yudin.     

A Fejér type theorem to determine jumps in terms of the Abel-Poisson mean of double Fourier series

We extend from single to double Fourier series a theorem of Zygmund to determine the generalized jumps of a periodic integrable function at a simple discontinuity point. As a by-product of the proof, we obtain an estimate of the fourth mixed partial derivative of the Abel-Poisson mean of any integrable function at such a point where is smooth. We also consider the extension of the Zygmund classes and to the two-dimensional torus .

     

Hypergeometric solutions for Coulomb self-energy model of uniformly charged hollow cylinder

The article aims at studying hypergeometric-type mathematical techniques based on the extension of a model previously used to describe the Coulomb self-energy of a uniformly charged a three-dimensional cylinder. The associated crossed term integral is investigated and solved by introducing a computational series built from hypergeometric-type terms for different values of parameters involved. The approach considered may be appealing for a broad audience of researchers working in mathematical physics or related disciplines.