Laguerre reproducing kernel method in Hilbert spaces for unsteady stagnation point ow over a stretching/shrinking sheet

This paper investigates the nonlinear boundary value problem resulting from the exact reduction of the Navier-Stokes equations for unsteady magnetohydrodynamic boundary layer flow over the stretching/shrinking permeable sheet submerged in a moving fluid.To solve this equation,a numerical method is proposed based on a Laguerre functions with reproducing kernel Hilbert space method.Using the operational matrices of derivative,we reduced the problem to a set of algebraic equations.We also compare this work with some other numerical results and present a solution that proves to be highly accurate.

Kernel Thesis Reproduction and Truncated Toeplitz Operators

Important operator characteristics (such boundedness or compactness) for particular classes of operators on particular reproducing kernel Hilbert spaces may be impacted by the behaviour of the operators on the reproducing kernels. These results have been shown for Toeplitz operators on the Paley-Wiener space, a reproducing kernel Hilbert space over C. Furthermore, we show how the norm of such an operator has no relation to the supremum of the norms of the pictures of the normalization reproducing kernels of the space. As a result, if this supremum is finite, the operator is implicitly bounded. To further demonstrate that the operator norm is not the same as the supremum of the norms of the pictures of the real normalized reproducing kernels, another example is also provided. We also set out a necessary and sufficient condition for the operators’ compactness in terms of their limiting function on the reproducing kernels.

INTERIOR ESTIMATES IN MORREY SPACES FOR SOLUTIONS OF ELLIPTIC EQUATIONS AND WEIGHTED BOUNDEDNESS FOR COMMUTATORS OF SINGULAR INTEGRAL OPERATORS

It is proved that, for the nondivergence elliptic equations Σi,jn=1aijuxixj=f, if f belongs to the generalized Morrey spaces Lp, (w), then uxixj ∈ Lp, (w), where u is the W2,p-solution of the equations. In order to obtain this, the author first establish the weighted boundedness for the commutators of some singular integral operators on Lp, (w).

Weighted estimates for commutators of singular integral operators with non-smooth kernels

In this paper, we establish the boundedness of commutators of singular integral operators with non-smooth kernels on weighted Lipschitz spaces Lipβ,ω. The condition on the kernel in this paper is weaker than the usual pointwise HSrmander condition.

BOUNDS FOR COMMUTATORS OF MULTILINEAR FRACTIONAL INTEGRAL OPERATORS WITH HOMOGENEOUS KERNELS

We will show bounds for commutators of multilinear fractional integral operators with some homogeneous kernels.

Multilinear commutators of BMO functions and multilinear singular integrals with non-smooth kernels

This paper is concerned with certain multilinear commutators of BMO functions and multilinear singular integral operators with non-smooth kernels. By the sharp maximal functions estimates, the weighted norm inequalities for this kind of commutators are established.

SHARP MAXIMAL FUNCTION ESTIMATES FOR MULTILINEAR SINGULAR INTEGRALS WITH NON-SMOOTH KERNELS

In this article we obtain weighted norm estimates for multilinear singular integrals with non-smooth kernels and the boundedness of certain multilinear commutators by making use of a sharp maximal function.

Boundedness of Multilinear Commutators with Rough Kernels on Morrey-Herz Spaces

This paper is concerning the commutators generated by the multilinear singular integral with rough kernels and BMO functions. The boundedness of the multilinear commutators Tb→ （f→） is established on the Morrey-Herz space by using the John-Nirenberg inequality.

Integral Representations for the Solutions of the Generalized Schroedinger Equation in a Finite Interval

We reduce the initial value problem for the generalized Schroedinger equation with piecewise-constant leading coefficient to the system of Volterra type integral equations and construct new useful integral representations for the fundamental solutions of the Schroedinger equation. We also investigate some significant properties of the kernels of these integral representations. The integral representations of fundamental solutions enable to obtain the basic integral equations, which are a powerful tool for solving inverse spectral problems.

Integral Operators Between Fock Spaces

In this paper,the authors study the integral operator■induced by a kernel functionφ(z,·)∈F_α~∞between Fock spaces.For 1≤p≤∞,they prove that S_φ:F_α^(1)→F_α^(p)is bounded if and only if■where k_(a)is the normalized reproducing kernel of F_α^(2);and,S_φ:F_α^(1)→F_α^(p)is compact if and only if■When 1<q≤∞,it is also proved that the condition(?)is not sufficient for boundedness of S_φ:F_α^(q)→F_α^(p).In the particular case■with ■∈F^(2)_α,for 1≤q<p<∞,they show that S_φ:F^(p)_α→F^(q)_αis bounded if and only if■;for 1<p≤q<∞,they give sufficient conditions for the boundedness or compactness of the operator S^(q)_φ:F^(p)_α→F_α.

变量核Marcinkiewicz积分交换子在变指标λ-中心Morrey空间上的有界性

应用核函数Ω(x,z)的性质,证明了由变量核Marcinkiewicz积分算子μ_(Ω,m)^(θ)与Lipschitz函数b生成的交换子μ_(Ω,m,b)^(θ)是变指标λ-中心Morrey空间M^(q(·),λ)(R^(n))上的有界算子,扩宽了以往的研究结果.

Generalized Weighted Morrey Estimates for Marcinkiewicz Integrals with Rough Kernel Associated with Schrodinger Operator and Their Commutators

Let L =-△+V(x) be a Schrodinger operator, where △ is the Laplacian on R^n,while nonnegative potential V(x) belonging to the reverse Holder class. The aim of this paper is to give generalized weighted Morrey estimates for the boundedness of Marcinkiewicz integrals with rough kernel associated with Schrodinger operator and their commutators.Moreover, the boundedness of the commutator operators formed by BMO functions and Marcinkiewicz integrals with rough kernel associated with Schrodinger operators is discussed on the generalized weighted Morrey spaces. As its special cases, the corresponding results of Marcinkiewicz integrals with rough kernel associated with Schrodinger operator and their commutators have been deduced, respectively. Also, Marcinkiewicz integral operators, rough Hardy-Littlewood(H-L for short) maximal operators, Bochner-Riesz means and parametric Marcinkiewicz integral operators which satisfy the conditions of our main results can be considered as some examples.

THE BEREZIN TRANSFORM AND ITS APPLICATIONS

We give a survey on the Berezin transform and its applications in operator theory. The focus is on the Bergman space of the unit disk and the Fock space of the complex plane. The Berezin transform is most effective and most successful in the study of Hankel and Toepltiz operators.

Some results for operators on a model space

We investigate some problems for truncated Toeplitz operators. Namely, the solvability of the Riccati operator equation on the set of all truncated Toeplitz operators on the model space Kθ = H^2θθH^2 is studied. We study in terms of Berezin symbols invertibility of model operators. We also prove some results for the Berezin number of the truncated Toeplitz operators. Moreover, we study some property for H2-functions in terms of noncyclicity of co-analytic Toeplitz operators and hypercyclicity of model operators.

带粗糙核的Marcinkiewicz积分交换子在齐次Morrey-Herz空间上的有界性

证明了一类带粗糙核的Marcinkiewicz积分算子与BMO(R^n)函数生成的交换子在齐次Morrey- Herz空间M(?)_(p,q)^(α,λ)(R^n)上的有界性.

再生核空间W2^1中的微分算子样条插值

在W2^1中借助于再生核函数给出了微分算子样条插值函数的显式表达式，证明了该样条插值算子与最佳插值逼近算子的一致性，而且插值误差依范数单调下降，由于该样条插值可分段表示，所以便于数值计算。

计算再生核的卷积方法

本文利用卷积及H^1(R)的再生核给出了一种计算H^n(R)空间再生核的新方法.并用此再生核建立求解n阶常微分方程的数值方法.

广义Morrey 空间上带变量核的Littlewood-Paley 算子

该文给出了一类带变量核的抛物型Littlewood-Paley算子g_Φ在广义Morrey空间L^(p,ω)(R^n)上的有界性。作为上述结果的应用,得到了g_φ与BMO函数b(x)生成的交换子[b,g_φ]在L^(p,ω)(R^n)上的有界性。

模糊数的四则运算性质及其线性方程

讨论模糊数的加、减、乘、除的运算性质,提出模糊数线性方程的概念,并给出这种方程的一种解法。

齐次Morrey-Herz空间上粗糙核分数次积分交换子及多线性算子的CBMO估计

利用齐次Morrey-Herz空间MK.pα,,qλ(Rnn)与齐次Herz空间.Kqα,p(Rnn)之间的关系,推广了.Kαq,p(Rnn)上的一些结果,在MK.pα,,qλ(Rnn)上建立了具有粗糙核的分数次积分交换子TΩb,l及多线性分数次积分算子TAΩ,l的中心有界平均振荡函数空间(CBMO)估计,并得到了分数次极大交换子MΩb,l和多线性分数次极大算子MΩA,l的相应结果.