修正的q-Baskakov-Durrmeyer-Stancu算子的逼近性质

基于q-微积分的概念引入一类修正的Stancu型q-Baskakov-Durrmeyerr算子,并且借助连续模研究该算子的一些局部逼近性质,得到了算子的局部逼近定理.同时讨论的算子的加权逼近.     

λ-Kantorovich算子的Voronovskaja型逆定理

介绍了 λ-Kantorovich算子并给出了该类算子矩的估计,利用连续模和K-泛函的关系,研究了 Voronovskaja型渐近公式,得到了 Grüss-Voronovskaja型逆定理.     

一类推广的q-Bernstein-Schurer-Kantorovich算子的逼近性质

基于q-整数的概念构造一类修正的Stancu型q-Bernstein-Schurer-Kantorovic算子,文中研究该算子的一些逼近性质,验证该算子的收敛性,并且利用光滑模和Lipschitz型极大函数的估计其收敛速度,同时,利用Korovkin型统计逼近定理研究Stancu型Bernstein-Schurer-Kantorovic算子的统计逼近性质.     

单纯型上广义Bernstein算子

该文引进并研究定义在n维单纯型上的广义Bernstein算子.首先,证明该算子具有对称性和保持Lipshcitz性质.其次,借助多元Ditzian-Totik连续模,得到该算子逼近连续函数的一个强型正向估计和一个弱型逆向不等式.最后,给出参数sn满足不同条件的若干Voronovskaja型展开式.该文所获得的结果包含了经典的Bernstein算子的相应结果.     

一类新型Chlodovsky算子的逼近性质研究

本文研究了一类基于非负实参数的新型Chlodovsky算子,用Ditzian-Totik光滑模与二阶连续模得到了逼近定理,然后研究了该算子对Lipschitz类函数的逼近误差上界,最后得到了该算子对一类导数为有界变差函数的绝对连续函数的收敛阶.     

一类修正的Lupas-Durrmeyer型算子的逼近性质研究北大核心CSCD

引入了一类修正的Lupas-Durrmeyer型算子,该算子不仅常数保持还线性保持.利用连续模,光滑模和K-泛函,讨论了该算子的某些逼近性质.最后还给出了该算子对Lipschitz函数类的逼近及Voronvskaya型渐近展开公式.     

λ-Kantorovich算子的逼近性质

首先在无穷空间上构造了一类新的λ-Szász-Kantorovich算子,通过分析计算得到了该类算子矩的估计及Korovkin型逼近性质;其次,利用连续模和K-泛函的等价关系给出了收敛速度的刻画;最后,借助于Holder不等式建立了Lipschitz连续函数的收敛定理.     

广义带参Bernstein-Bézier算子的逼近性质

该文首先介绍了一种新的含参量Bernstein-Bézier型算子;然后,研究了该类算子矩的估计,给出了用连续模表示的收敛速度;最后,得到了这些算子逼近的等价定理.     

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.     

q-Baskakov型算子的A-统计逼近

引入一类q-Baskakov型算子,对一个非负正则可求和矩阵A,应用A-统计逼近的理论,研究了这类修正的Korovkin型统计逼近性质.对于0q≤1,借助连续性模,证得这类q-Baskakov型算子的收敛速度要优于q-Baskakov算子.     

On Approximation Properties of Generalized q-Bernstein Operators

In this study, we identify a generalization of q-Bernstein type operators and investigate approximation properties of a sequence of these operators . We estimate rate of approximation by modulus of continuity. We prove Voronovskaya type theorem for these operators.     

一类Durrmeyer算子线性组合的加权逼近

本文主要给出了一类Ｂｅｒｎｓｔｅｉｎ－Ｄｕｒｒｍｅｙｅｒ算子的线性组合在Ｌｐ逼近意义下加Ｊａｃｏｂｉ权逼近时的特征刻划．     

Approximation Properties by q-Durrmeyer-Stancu Operators

In this paper, we are dealing with q-Bemstein-Durrmeyer-Stancu operators. Firstly, we have estimated moments of these operators. Then we have discussed some approximation properties and asymptotic formulas. We have obtained better estimations by using King type approach and given statistical convergence for the operators.     

The Integral Type Modification of Jain Operators and its Approximation Properties

Abstract

In the present paper, we discuss the approximation properties of Durrmeyer-Stancu type variant of Jain operators with the modified forms of the Beta basis functions. We establish some direct results, which include the asymptotic formula, the error estimation in terms of the modulus of continuity and weighted approximation. Also, we construct a King modification of these operators which preserves the test functions e₀ and e₁.     

Approximation Properties of Two-Dimensional q-Bernstein-Chlodowsky-Durrmeyer Operators

This article deals with the Durrmeyer-type generalization of the q-Bernstein-Chlodowsky operators on a rectangular domain (which were introduced by Büyükyaz?c? [2 ?. Büyükyaz?c? ( 2009 ). On the approximation properties of two-dimensional q-Bernstein-Chlodowsky polynomials . Math. Commun. 14 : 255 – 269 .[Web of Science ®] , [Google Scholar]]). We obtain the Korovkin-type approximation properties and the rates of convergence of this generalization using the means of the modulus of continuity and using the K-functional of Peetre. Further, we establish the weighted approximation properties for these operators.     

On Genuine Bernstein–Durrmeyer Operators

We continue the studies on the so–called genuine Bernstein–Durrmeyer operators U _n by establishing a recurrence formula for the moments and by investigating the semigroup T(t) approximated by U _n . Moreover, for sufficiently smooth functions the degree of this convergence is estimated. We also determine the eigenstructure of U _n , compute the moments of T(t) and establish asymptotic formulas. Received: January 26, 2007.     

Steckin-Marchard-Type Inequalities for Some Durrmeyer Operators

In this paper, we will derive some Steckin-Marchard-type inequalities for Bernstein-Durrmeyer and Szasz-Durrmeyer operators.     

Approximation Properties For Modified q-Bernstein-Kantorovich Operators

The purpose of this article is to give a generalization of q-Bernstein-Kantorovich operators. We present some approximation theorems. We compute the rate of convergence and error estimation of these operators by means of the modulus of continuity. Furthermore, we give some numerical examples to show comparisons in illustrative graphics for the convergence of these operators to various functions.