关于修正的Baskakov算子的Stechin-Marchaud型不等式

利用K-泛函研究了修正的Baskakov型算子的Stechin-Marchaud型不等式,由此不等式,我们得到了关于ω2φλ的逆结果.     

正线性算子的Young型逆不等式的一个改进（英文）

本文研究了正线性算子的Young型逆不等式的问题.利用算子单调函数以及凸函数的性质,获得了若干带有Kantorovich常数的Young型逆不等式标量形式及相对应的正线性算子的Young型逆不等式的改进形式,推广了现有文献中的结论.     

正线性算子的Young型逆不等式的一个改进

本文研究了正线性算子的Young型逆不等式的问题.利用算子单调函数以及凸函数的性质,获得了若干带有Kantorovich常数的Young型逆不等式标量形式及相对应的正线性算子的Young型逆不等式的改进形式,推广了现有文献中的结论.     

关于Bernstein-Durrmeyer算子的Stechkin-Marchaud型不等式

主要目的是利用K-泛函来研究Bernstein-durrmeyer型算子的Stechkin-Marchaud型不等式，由此不等式，我们推广子B-D算子关于ω^2ψλ（f,t)的逆结果。     

Baskakov型算子加权逼近下的Stechkin-Marchaud不等式

本文利用K-泛函与光滑模的等价性,研究了Baskakov型算子加Jacobi权逼近下的Stechkin-Marchaud不等式,并得到了Baskakov型算子关于ω_φ²(f,t)_ω的逆结果.     

Szász-Durrmeyer算子强逆不等式

引入K-泛函K(f,t)n对Szász-Durrmeyer算子证明了其强逆不等式,推广了此算子关于ω2ψλ(f,t)(0≤λ≤1)的逆结果.     

Szász-Durrmeyer算子强逆不等式

引入K-泛函K（f,t）n对Szász-Durrmeyer算子证明了其强逆不等式,推广了此算子关于ω~（2φ~λ）（f,t）（0≤λ≤1）的逆结果.     

无穷角形域Baskakov型算子族的Lipschitz类保持性质

本文利用分裂随机向量的方法证明了无穷角形域上Baskakov型算子族的Lipschitz类保持性质,然后,利用概率论的技术结合逼近论的方法证明在一定条件下逆命题也成立。     

两类离散哈密顿系统极限点型的判定

利用算子的谱理论及经典的不等式,讨论两类离散哈密顿系统,得出半退化型系统为强极限点型以及Dirac型系统为极限点型的一些判别准则．     

Baskakov算子加权逼近的收敛阶

本文讨论了Ｂａｓｋａｋｏｖ算子加Ｊａｃｏｂｉ权逼近的收敛性，首先指出了按通常的加权范数，Ｂａｓｋａｋｏｖ算子是无界的。然后引入一种新的范数，在此范数下Ｂａｓｋａｋｏｖ算子具有压缩性，最后借助于Ｋ－泛函，我们着重讨论了它的特征刻划问题。     

一类多元Gauss-Weierstrass 算子线性组合的加权Lp-逼近

本文研究一类多元Gauss-Weierstrass算子的线性组合加Jacobi型权逼近的性质,利用加权矩量不等式及加权K-泛函、光滑模等工具,建立了这类算子在Lp(1≤p≤∞)空间的正、逆定理和逼近阶的特征刻划.     

Bernstein算子的强逆不等式

本文对Bernstein算子证明了其强逆不等式,这些不等式曾被Ditzian,Ivanov,Totik,李松等人用不同的方法得到过,但其结果是通常的估计(λ=1),古典的结果(λ=0)没有包含,本文引入κ-泛函K_λ~α(f,t~2)(0≤λ≤1,0<α<2),将已有结果推广到0≤λ≤1的情形。     

Complementarity Problems and Variational Inequalities. A Unified Approach of Solvability by an Implicit Leray-Schauder Type Alternative

In several recent papers we obtained existence theorems for complementarity problems and variational inequalities using for each of them a particular notion of exceptional family of elements. Now, in this paper we introduce a new notion of exceptional family of elements. This notion is based on an Implicit Leray-Schauder Alternative. By this new notion we obtain a unification of the study of solvability of complementarity problems and of variational inequalities. The paper is finished with a section dedicated to variational inequalities with δ-pseudomonotone operators.     

球面卷积算子逼近

研究d维欧氏空间R~d中单位球面上卷积算子的逼近问题.利用球面乘子理论以及K-泛函与光滑模等价关系,建立一类球面卷积算子逼近的正、逆定理.特别地,给出了逼近的强型逆向不等式,从而揭示了该类球面卷积算子的本质逼近阶.此外,作为应用,给出了球面Jackson-Matsuoka卷积算子与Abel-Poisson卷积算子逼近上、下界的相同阶估计.     

Lp空间Shepard算子逼近的正逆定理

本文引入了一种修正的积分型Shepard算子,建立了相应的Jackson型定理,并通过建立Bernstein型不等式,给出了算子在L[0,1]p空间中一种新的逼近阶刻画的等价形式,得到了逼近的逆定理．     

从矩阵迹关系过渡到算子迹关系的一个通用方法

本文给出了一个将矩阵迹的不等式推广为Ｈｉｌｂｅｒｔ空间中算子迹的不等式的方法，并用它较简捷地将矩阵论中Ｂｅｌｌｍａｎ问题的已有结果以及其它一些矩阵迹的不等式推广为算子迹的相应不等式。     

Lower Estimates for Centered Bernstein-Type Operators

We obtain converse inequalities of type A in the uniform distance for centered Bernstein-type operators in terms of suitable Ditzian—Totik moduli of smoothness. We use probabilistic representations of the operators in terms of stochastic processes as well as approximation-theoretic techniques. October 16, 2000. Date revised: January 15, 2001. Date accepted: March 12, 2001.     

Projection algorithms for solving a system of general variational inequalities

In this paper, we introduce and consider a new system of general variational inequalities involving four different operators. Using the projection operator technique, we suggest and analyze some new explicit iterative methods for this system of variational inequalities. We also study the convergence analysis of the new iterative method under certain mild conditions. Since this new system includes the system of variational inequalities involving three operators, variational inequalities and related optimization problems as special cases, results obtained in this paper continue to hold for these problems. Our results can be viewed as a refinement and improvement of the previously known results for variational inequalities.     

On a system of general mixed variational inequalities

In this paper, we introduce and consider a new system of general mixed variational inequalities involving three different operators. Using the resolvent operator technique, we establish the equivalence between the general mixed variational inequalities and the fixed point problems. We use this equivalent formulation to suggest and analyze some new explicit iterative methods for this system of general mixed variational inequalities. We also study the convergence analysis of the new iterative method under certain mild conditions. Since this new system includes the system of mixed variational inequalities involving two operators, variational inequalities and related optimization problems as special cases, results obtained in this paper continue to hold for these problems. Our results can be viewed as a refinement and improvement of the previously known results for variational inequalities.