程度下近似算子与变精度上近似算子的差运算模型

目的是探讨精度与程度的复合,建立并研究新的粗糙集拓展模型.基于程度与精度的逻辑差需求,提出了程度下近似算子与变精度上近似算子的差运算模型,得到了程度下近似算子与变精度上近似算子的差运算的宏观本质、精确描述与基本性质.并用一个医疗实例说明了模型的意义和应用.程度下近似算子与变精度上近似算子的差运算模型,部分的拓展了程度粗糙集模型和经典粗糙集模型.     

Baskakov—Durrmeyer算子的同时逼近

本文讨论Baskakov-Durrmeyer算子对具有指数型增长的第一类间断点函数及其导数的逼近。     

Probabilistic Approximation of the Evolution Operator

A method for approximation of the operator e^?itH, where \(H = - \frac{1}{2}\frac{{{d^2}}}{{d{x^2}}} + V(x)\), in the strong operator topology is proposed. The approximating operators have the form of expectations of functionals of a certain random point field.     

Approximation of Functions by Baskakov-Kantorovich Operator

We characterize the approximation of functions in L_p norm by Baskakov-Kantorovich operator. We define an appropriate K-functional and prove a direct and strong converse inequality of type B in terms of the K-functional.     

On Nonlinear Operator Approximation with Preassigned Accuracy

In this paper, we provide a state-of-the-art survey of some recent methods in nonlinear operator approximation theory and its applications. We give existence theorems for approximating operators. and discuss corresponding numerical schemes. The new results are natural but very specific extensions of known techniques to the so-called realistic operator approximation.     

Approximation by a Generalized Szasz Type Operator

Using a method given by Jakimovski–Leviatan, we introduce a Favard-Szasz type operator. We study the properties of approximation for a function in the space of functions having an exponential growth at infinity. This operator is a generalization of an operator introduced by M. Lesniewicz and L. Rempulska [3].     

Approximation for Certain Stancu Type Summation Integral Operator

In the present paper,we consider Stancu type generalization of the summation integral type operators discussed in [15].We apply hypergeometric series for obtaining moments of these operators.We also discuss about asymptotic formula and error estimation in terms of modules of continuity.     

属性粗糙集的新型近似算子

由等价类中元素属性测度的上、下确界定义的属性粗糙集,没有充分反映等价类中其它元素的作用,在信息处理中不免造成元素信息的丢失.为此提出一种新的属性粗糙集近似算子的表示方法,给出了相应的性质并实例说明了这一方法的合理性.     

Extended Best Polynomial Approximation Operator in Orlicz Spaces

In this article we consider the best polynomial approximation operator, defined in an Orlicz space L ^Φ(B), and its extension to L ^?(B) where ? is the derivative function of Φ. A characterization of these operators and several properties are obtained.     

有界线性算子逼近问题中算子本质谱弧立点的处理

在Hilbert空间线性算子逼近论中,算子本质的孤立点通常是处理一些问题的主要障碍之一,本给出处理算子本质谱的孤立点的一般方法。     

关于算子空间逼近性质的一个注记

考虑算子空间和C*-代数的算子空间逼近性质,强箅子空间逼近性质与分片映射性质之间的某些关系.     

Maximal Inequalities for the Best Approximation Operator and Simonenko Indices

In an abstract set up, we get strong type inequalities in L~(p+1) by assuming weak or extra-weak inequalities in Orlicz spaces. For some classes of functions, the number p is related to Simonenko indices. We apply the results to get strong inequalities for maximal functions associated to best Φ-approximation operators in an Orlicz space L~Φ.     

推广的Kantorovich算子在Ba空间中的逼近

利用Ditzian-Totik光滑模,研究了推广的Kantorovich算子在Ba空间中的逼近,得到逼近的正定理与等价定理.所得结果改进、推广和统一了一些作者的结果.     

Approximation Spaces in the Numerical Analysis of Operator Equations

We show that generalized approximation spaces can be used to prove stability and convergence of projection methods for certain types of operator equations in which unbounded operators occur. Besides the convergence, we also get orders of convergence by this approach, even in case of non-uniformly bounded projections. We give an example in which weighted uniform convergence of the collocation method for an easy Cauchy singular integral equation is studied.     

m-增生算子方程解的Mann和Ishikawa迭代逼近

研究了Ｂａｎａｃｈ 空间中具 ｍ＿ 增生算子的方程解的Ｍａｎｎ 和Ｉｓｈｉｋａｗａ 迭代逼近问题·　研究结果改进和发展了一些文献中的最新成果·     

Approximation of the Inverse Frame Operator and Applications to Gabor Frames

A frame allows every element in a Hilbert space to be written as a linear combination of the frame elements, with coefficients called frame coefficients. Calculation of the frame coefficients requires inversion of an operator S on . We show how the inverse of S can be approximated as close as we like using finite-dimensional linear algebra. In contrast with previous methods, our approximation can be used for any frame. Various consequences for approximation of the frame coefficients or approximation of the solution to a moment problem are discussed. We also apply the results to Gabor frames and frames consisting of translates of a single function.     

Musielak-Orlicz-Sobolev空间中的序连续性质和最佳逼近算子的连续性质

借鉴Orlicz-Sobolev空间中的受控最佳逼近算子问题的研究结果,抓住Musielak-Orlicz-Sobolev空间的构成特点,利用△_2条件及其否定,给出了MusielakOrlicz-Sobolev空间具有序连续性的充要条件,同时研究了该空间中最佳逼近算子的连续性.     

Bernstein-Fan算子的推广及其逼近等价定理

对Bernstein-Fan算子进行推广，并在此基础上进一步探讨其一致收敛性以及导数与连续模之间的关系。