单纯形上的q-Stancu多项式的最优逼近阶

构造了单纯形上的多元q-Stancu多项式,它是著名的Bernstein多项式和Stancu多项式的推广.建立该类多项式逼近连续函数的上、下界估计,进而给出其对连续函数的最优逼近阶(饱和阶)及其特征刻画.此外,还研究了该类多项式逼近连续函数的饱和类.     

多元Stancu多项式与连续模

本文研究单纯形上多元Stancu多项式与连续模之间的关系,证明了Stancu多项式具有保持连续模的性质,推广了一元Bernstein多项式的相应结果.同时,利用多元函数的Ditzian-Totik连续模估计Stancu多项式逼近多元连续函数速度的上界和下界,得到一个使得逼近速度为O(n-a)(0相似文献   

多元推广的Bernstein算子的逼近性质

构造了一类一致收敛于被逼近函数的多元序列,以此序列为基础,运用多元函数的全连续模及部分连续模来刻画这种多元推广的Bernstein算子的逼近性质,不仅得出了理论逼近结果,而且给出了数值逼近的例子.     

多元多项式环上模的中国剩余定理

中国剩余定理在数论及代数中起着重要的作用.在多元多项式环中,中国剩余定理可以转化为多元多项式同余方程组的求解,借助代数理论,可以找到满足同余方程组的多项式.本文研究多元多项式环上关于模的中国剩余定理,并利用模的Gr?bner基理论与方法找出满足模的中国剩余定理的多项式向量,从而找到多项式环上模的同余方程组的解.     

分段低次插值多项式序列的一致收敛性

利用分段线性与三次Hermite插值基函数以及连续模概念,分别推导出分段线性与三次Hermite插值多项式序列一致收敛于被插函数.     

Orlicz空间中复系数多项式倒数逼近

本文利用K-泛函、加权连续模与极大函数等工具,借助不等式技巧,在Orlicz空间内研究了复系数多项式的倒数逼近问题,得到了收敛速度估计的结果.     

Z／mZ上的多元置换多项式

本文研究了一类典型的模ｐ的多元奇异多项式，得到了它们是模Ｐｌ（ｌ＞１）的置换多项式的充要条件并给出了一个是模ｐ２的置换多项式但不是模ｐ３的置换多项式的多元多项式例子，从而说明模ｐｌ（ｌ＞１）的多元置换多项式不能（象一元那样）简化到模ｐ上．     

单纯形上Durrmeyer多项式对连续函数收敛速度的估计

以Ｋ－泛函、光滑模为工具，利用函数分解等方法，研究单纯形上多元Ｄｕｒｒｍｅｙｅｒ多项式逼近连续函数的速度问题，估计了收敛速度，从而完善了Ｂｅｒｅｎｓ，Ｈ　等人的工作．     

Z/plZ上一类典型的多元奇异置换多项式

本文得到了一类典型模p奇异的n元多项式是模pl置换多项式的一个充分必要条件.特别地,对任意正整数u＞1,本文得到了一个模pu的但不是pu+1的置换多项式.这些结果是对张起帆、胡永忠等人的若干已知结果的推广和改进.     

Z/plZ上一类典型的多元奇异置换多项式

本文得到了一类典型模p奇异的n元多项式是模pl置换多项式的一个充分必要条件.特别地,对任意正整数u＞1,本文得到了一个模pu的但不是pu+1的置换多项式.这些结果是对张起帆、胡永忠等人的若干已知结果的推广和改进.     

Approximation by Means of Kantorovich-Stancu Type Operators

The purpose of this article is to give a Kantorovich generalization of Stancu type polynomials. We obtain convergence properties of our operators in the continuous function space and Lebesgue spaces. Furthermore, we get the order of approximation with the help of modulus of continuity and give a numerical example for approximation.     

单纯形上的Stancu多项式与最佳多项式逼近

作为Bernstein多项式的推广,本文定义单纯形上的多元Stancu多项式.以最佳多项式逼近为度量,建立Stancu多项式对连续函数的逼近定理与逼近阶估计,给出Stancu多项式的一个逼近逆定理,从而用最佳多项式逼近刻划Stancu多项式的逼近特征.     

On a <Emphasis Type="Italic">q</Emphasis>-analogue of Stancu operators

This paper is concerned with a generalization in q-Calculus of Stancu operators. Involving modulus of continuity and Lipschitz type maximal function, we give estimates for the rate of convergence. A probabilistic approach is presented and approximation properties are established.     

Stancu Type Generalization of Dunkl Analogue of Szàsz Operators

In this paper, we introduce Stancu type generalization of Dunkl analogue of Szàsz operators. We obtain some direct results, which include asymptotic formula and error estimation in terms of of the modulus continuity. Also, we investigate the convergence of these operators in a weighted space and estimate the rate of convergence.     

Stancu‐type generalization of Dunkl analogue of Szász–Kantorovich operators

The purpose of the paper is to introduce Stancu‐type linear positive operators generated by Dunkl generalization of exponential function. We present approximation properties with the help of well‐known Korovkin‐type theorem and weighted Korovkin‐type theorem and also acquire the rate of convergence in terms of classical modulus of continuity, the class of Lipschitz functions, Peetre's K‐functional, and second‐order modulus of continuity by Dunkl analogue of Szász operators. Copyright © 2015 John Wiley & Sons, Ltd.     

<Emphasis Type="Italic">q</Emphasis>- Lupas Kantorovich operators based on Polya distribution

The purpose of the present paper is to introduce a Kantorovich modification of the q-analogue of the Stancu operators defined by Nowak (J Math Anal Appl 350:50–55, 2009). We study a local and a direct approximation theorem by means of the Ditzian–Totik modulus of smoothness. Further A-statistical convergence properties of these operators are investigated. Next, a bivariate generalization of these operators is introduced and its rate of convergence is discussed with the aid of the partial and complete modulus of continuity and the Peetre‘s K-functional.     

STANCU POLYNOMIALS BASED ON THE Q-INTEGERS

A new generalization of Stancu polynomials based on the q-integers and a nonnegative integer s is firstly introduced in this paper.Moreover,the shape-preserving and convergence properties of these polynomials are also investigated.     

On Pointwise Convergence of q-Bernstein Operators and Their q-Derivatives

Pointwise convergence of q-Bernstein polynomials and their q-derivatives in the case of 0 < q < 1 is discussed. We study quantitative Voronovskaya type results for q-Bernstein polynomials and their q-derivatives. These theorems are given in terms of the modulus of continuity of q-derivative of f which is the main interest of this article. It is also shown that our results hold for continuous functions although those are given for two and three times continuously differentiable functions in classical case.     

多元StancU多项式的最优逼近阶及其特征刻画

对于单纯形上的多元Stancu多项式Mn(f，x)(它是多元Bernstein多项式的广义形式)，我们给出其对连续函数的最优逼近阶及其特征刻画，即我们将依据某-K-泛函确定满足‖Mnf-f‖=O(n^-1)的函数类．同时，得到了逼近的正定理和逆定理．