广义p-Laplace算子相关的非线性边值问题解的存在性

本文首先把p-Laplace算子推广为广义p-Laplace算子,然后利用非线性增生映射值域的扰动理论研究了与广义p-Laplace算子相关的具有牛曼边值的非线性椭圆问题在LP(Ω)空间中解的存在性,其中2≤p< ∞．本文所讨论的方程及所用的方法是对以往一些工作的补充和延续．     

LITTLEWOOD-PALEY THEOREM FOR SCHR DINGER OPERATORS

Let H be a Schrodinger operator on Rn. Under a polynomial decay condition for the kernel of its spectral operator, we show that the Besov spaces and Triebel-Lizorkin spaces associated with H are well defined. We further give a Littlewood-Paley characterization of Lp spaces in terms of dyadic functions of H. This generalizes and strengthens the previous result when the heat kernel of H satisfies certain upper Gaussian bound.     

Chaotic weighted shifts in Bargmann space

This paper deals with the unilateral backward shift operator T on a Bargmann space F(C). This space can be identified with the sequence space ?²(N). We use the hypercyclicity criterion of Bès, Chan, and Seubert and the program of K.-G. Grosse-Erdmann to give a necessary and sufficient condition in order that T be a chaotic operator. The chaoticity of differentiation which correspond to the annihilation operator in quantum radiation field theory is in view, since the Bargmann space is an infinite-dimensional separable complex Hilbert space.     

一类向量值积分方程的优化问题

提出了一类带有参数的向量值积分的优化问题,将H ardy空间中的一些概念推广到了局部凸空部间,尤其是将H ankel算子、最小模型匹配误差、最优解等概念推广到了局部凸空间.     

套代数模中酉算子的存在性

假设套N是可接受的,则得到弱闭Alg(N)-模u中存在酉算子的充要条件是I-=I且对任意 M>0,有N->0.     

Homogenization of Semilinear Parabolic Operators in a Perforated Cylinder

In this paper, we consider a semilinear parabolic equation of second order with lower term a power function of the unknown function and prove that the sequence of solutions in a perforated cylinder tends to a solution in a unperforated cylinder if the radii of rejected balls in the parabolic metric tend to zero at the rate depending on the exponent of the power function in the lower term.     

超球Bloch空间上的有界加权复合算子

本文证明了高维超球Bloch空间上的加权复合算子成为有界算子的一个充分且必要的条件.     

On unbounded subnormal operators

A minimal normal extension of unbounded subnormal operators is established and characterized and spectral inclusion theorem is proved. An inverse Cayley transform is constructed to obtain a closed unbounded subnormal operator from a bounded one. Two classes of unbounded subnormals viz analytic Toeplitz operators and Bergman operators are exhibited.     

Quasi-compactness and absolutely continuous kernels

We show how the essential spectral radius r _e (Q) of a bounded positive kernel Q, acting on bounded functions, is linked to the lower approximation of Q by certain absolutely continuous kernels. The standart Doeblin’s condition can be interpreted in this context, and, when suitably reformulated, it leads to a formula for r _e (Q). This results may be used to characterize the Markov kernels having a quasi-compact action on a space of measurable functions bounded with respect to some test function, when no irreducibilty and aperiodicity are assumed.      

Hardy空间上Fourier级数的Cesàro求和

研究了Hardy空间上Ces劋ro算子的有界性.证明极大Ces劋ro算子的强型和弱型有界估计.其弱有界性估计是精确的.推广和加强了已有研究结果.