Nassrallah-Rahman积分的一个新证明

应用关于ｑ－微分算子的Ｌｅｉｂｎｉｚ公式证明了关于ｑ－微分算子的两个恒等式．利用这些恒等式及ｑ－级数的一些求和公式给出了Ｎａｓｒａｌａｈ－Ｒａｈｍａｎ积分的一个新证明，进而给出了关于ｑ－级数８Φ７的积分表示的一个简易推导     

双参数有限q指数算子及其应用

本文构造两个双参数有限q指数算子,得到了几个算子恒等式;应用这些算子恒等式到著名的q-Chu-Vandermonde求和恒等式,求导了若干奇异的q-级数恒等式,包含著名的Jackson恒等式的一个推广.     

中点不等式和梯形不等式的量子模拟

建立了涉及二阶q-导数的积分恒等式,使用这个恒等式获得二阶可微函数中点不等式和梯形不等式的量子模拟.     

Gould-Hsu-Carlitz反演与Rogers-Ramanujan恒等式(Ⅰ)

本文将论述通过q-级数互反关系证明经典分拆恒等式的一般方法。应用Carlitz给出的Gould-Hsu反演的q-模拟,作者将建立一个重要的和式变换定理。作为例证:结合Jacobi三重积恒等式及组合计算技巧,给出Rogers-Ra-manujan恒等式一个新的简单推证。     

样条函数中的多项式Φ_n(λ,z)的一个应用

运用多项式Φ_n(λ,z)及其一个恒等式,建立了微分算子与差分算子的一种联系, 多项式在具有均匀间距的样条函数的理论与方法中是有看重要作用的,这里我们先导出关于Φ_n(λ,z)的一个恒等式,继而应用它,研究和建立微分算子和差分算子之间的一种联系。     

关于微分算子的若干恒等式与Hermite多项式

通过求解一个偏微分方程，得到了若干微分算子恒等式．利用这些恒等式，很自然地推出了关于Ｈｅｒｍｉｔｅ多项式的一些著名结果．     

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.     

q-Bernstein-Durrmeyer型算子的逼近性质

基于q-整数概念,引进一类q-Bernstein-Durrmeyer型算子,研究该算子列的一些逼近性质.得到算子列的一个Korovkin型收敛定理,并给出算子列收敛速度的一些估计和一个Voronovskaja型结果.     

J—自共轭微分算子谱的定性分析

本文对J－自共轭微分算子谱理论研究情况做一些概要性的介绍,第一部分简要回顾了J－自共轭微分算子理论研究的发展过程,第二,三部分介绍了J－自共轭微分算子的本质谱和离散谱定性分析的主要方法和结论;第四部分扼要叙述J－自共轭微分算子其它方面的一些工作,以及J－自共轭微分算子谱理论研究中尚待解决的问题。     

基于广义q-阶正交模糊混合平均算子的多属性决策方法

本文研究q-阶正交模糊环境中广义混合平均算子的多属性决策问题。首先,针对多属性决策时需掌控变量间的权重关系以及减少极端数值对决策结果造成影响的两种需求,本文将q-阶正交模糊数与广义混合平均算子相结合,提出广义q-阶正交模糊混合平均算子。其次,对广义q-阶正交模糊混合平均算子的相关性质进行证明。最后,给出一种基于该算子的多属性决策方法,并用实例验证该方法的可行性和有效性。     

An operator not satisfying Lomonosov's hypothesis

An example is presented of a Hilbert space operator such that no non-scalar operator that commutes with it commutes with a non-zero compact operator. This shows that Lomonosov's invariant subspace theorem does not apply to every operator.     

一类非线性算子方程的正算子解的研究

研究了算子方程X^(-1)+A(-1)+A⁺X+X^tA=Q,的正算子解问题,给出了此类非线性算子方程正算子解的范围以及正算子解存在的一些充分必要条件,并用迭代的方法得到了方程的正算子解.     

Applications of polar decompositions of idempotent and 2-nilpotent operators

An operator means a bounded linear operator on a complex Hilbert space. Using two polar decompositions of idempotent and 2-nilpotent operators, we shall study numerical radii of these two operators and finally we shall discuss two operator transformations, one of which is the generalized Aluthge transformation and another is an extension of the operator transformation by Patel-Tanahashi-Uchiyama.     

An example in the theory of stable Markov operators

An example of a Markov transtion operator acting onC(X) is constructed in which the restriction of the operator to the conservative part ofX is not a conservative operator.     

算子方程X+A~*X~(-t)A=Q的正算子解的研究

研究了算子方程X+A*X~(-t)A=Q(t>1)的正算子解问题,分别给出了算子方程X+A*X~(-t)A=Q有正算子解的一些充分条件和必要条件,并确定了解的范围,用迭代的方法得到方程的正算子解.     

An exponentially convergent algorithm for nonlinear differential equations in Banach spaces

An exponentially convergent approximation to the solution of a nonlinear first order differential equation with an operator coefficient in Banach space is proposed. The algorithm is based on an equivalent Volterra integral equation including the operator exponential generated by the operator coefficient. The operator exponential is represented by a Dunford-Cauchy integral along a hyperbola enveloping the spectrum of the operator coefficient, and then the integrals involved are approximated using the Chebyshev interpolation and an appropriate Sinc quadrature. Numerical examples are given which confirm theoretical results.

     

Inclusions and Identities for the Moore-Penrose Inverse of a Closed Linear Operator

A number of operator inclusions, and identities, involving the Moore-Penrose inverse of a closed densely defined linear operator, are presented. Some of these inclusions generalize known identities in the case when the operator is bounded and has closed range. An application to a known compactness criterion for the Moore-Penrose inverse is also given.     

Shepard-Bernoulli operators

We introduce the Shepard-Bernoulli operator as a combination of the Shepard operator with a new univariate interpolation operator: the generalized Taylor polynomial. Some properties and the rate of convergence of the new combined operator are studied and compared with those given for classical combined Shepard operators. An application to the interpolation of discrete solutions of initial value problems is given.

     

Products of Nevanlinna-Pick kernels and operator colligations

An example is given which clarifies the present situation of the operator norm convergence of Trotter-Kato product formula. It shows that the rate of convergence of the formula with respect to the operator norm obtained in [NZ2] is best possible. It also yields a counter-example of the operator norm convergence of the formula in another case.     

Interpolation of polynomial operators in a Hilbert space

An interpolant with orthonormal nodes is constructed for a polynomial operator of a given degree defined on an abstract Hilbert space. An estimate for the interpolation accuracy is derived in the metric of the space of operator values, while in the case where nodes are elements of a basis, the pointwise convergence of the interpolational operator process in this metric is proved as the number of nodes increases. Bibliography: 7 titles. Translated fromObchyslyuval'na ta Prykladna Matematyka, No. 79, 1995, pp. 3–9