多连通域之间的共形映射及其Schwarz导数

证明了扩充复平面C的多连通子区域之间的共形映射的一个分解定理,并利用此定理给出了定义在C的多连通子区域内的单叶全纯函数的双曲上确界范数的一致有界性的一个简单证明.     

代数体函数与全纯函数线性组合的唯一性定理

本文讨论重值、亏量对唯一性问题的影响,给出代数体函数与全纯函数线性组合的一个唯一性定理。 1.关于代数体函数的唯一性定理G.Valiron首先在中宣布一个结果,但未有详证且其精度不及亚纯函数者,在中曾精密化和推广中的结论,本节将进一步讨论代数体函数的唯一性问题。     

全纯扩充的BHW定理的推广

本文得到关于全纯扩充的BHW定理的一个全新的证明,同时也对BHW定 理做出了更一般的推广,并且给出了推广后的BHW定理的两种不同的证明方法.     

光滑流形的同调论及其推广

在近代光滑流形的理论中,将流形的解析性质与拓扑性质关联起来的著名的DeRham定理起着重要的作用。实际上De Rham定理是Leray首先证明的一个唯一性定理的特殊情形。这个定理Leray是在极大的一般性之下很复杂地证明的。后来J.Fáry在一个简短的报导中在一个比较不顶一般的形式下很简单地证明了唯一性定理。本文的目的就是要详尽地阐明Fáry的证明。     

Hilbert空间中广义平衡问题和无限族非扩张映象的不动点问题的强收敛定理

在Hilbert空间中,用Fan-KKM定理导出了广义平衡问题的辅助问题的解的存在性和唯一性,讨论了寻找广义平衡问题和一族非扩张映象的公共不动点集的迭代序列,证明此序列强收敛于这两个集合的公共元.本文结论改进了一些近期结果.     

以较低截断重数分担超平面的亚纯映射的唯一性问题

首先证明了一些以较低截断重数分担2n+2个超平面的亚纯映射的唯一性定理.最后一章给出了在条件f~(-1)(H_j)■g~(-1)(H_j)及q≥2n+3下的一个唯一性定理的简单证明.     

关于一个超越性定理及其应用

本文对文［1］中一个超越性定理给出另外两个不同的简单证明,并用来证明某些通过在数域上定义的无穷乘积表示的函数在代数点上的值的超越性,从而构造了一些新的超越数.     

惯性定理唯一性的矩阵证明

对于惯性定理唯一性的证明,在现行教科书中有两种证明方法,一种是用齐次线性方程组理论给出的证明,另一种是通过引入双线性函数的概念,借助于向量空间的理论给出的证明。本文拟通过分块矩阵的理论,给出惯性定理唯一性的另外一种证明方法。惯性定理设实数域R上一个n元二次型f(x)=X'AX经过非退化线性替换变成规范形     

一类Liouville型定理

<正> 古典的 Liouville 定理说:全平面上有界的全纯函数必是常数.在多复变函数论里,有许多定理是研究什么样的复流形上不存在非常值或非退化的(有界)全纯函数或全纯映照.这类定理可以统称为 Liouville 型定理.与一个复变数情况不同的是这类定理大多可以由复流形上的 Schwarz 引理推出.例如,S.T.Yau 证明了一个 Schwarz 引理后     

本质有穷的全纯函数及其导数的Borel例外值

本文对于复平面上的全纯函数,推广通常的增长级为p阶增长级,引进本质有穷的概念,进而研究本质有穷的全纯函数及其导数的Borel例外值的存在性.将通常意义下有限级全纯函数的Hadamard因子分解定理推广到本质有穷的全纯函数上来,在此基础上,将熟知的Borel例外值定理推广到本质有穷全纯函数的情形.然后,将Milloux等人关于全纯函数及其导数的Picard值的存在性定理推广为本质有穷的全纯函数及其导数的Borel例外值的存在性定理.     

Meromorphic Functions on a Riemann Surface to a Locally Semi-convex Space

In this article, vector-valued holomorphic and meromorphic functions on a Riemann surface to a complete Hausdorff locally semi-convex space are discussed. By introducing the concepts of vector-valued holomorphic and meromorphic differential forms, Cauchy's theorem and the Residue theorem of a vector-valued differential form on a Riemann surface are proved. Using the theory on the operator and the theory of a cohomology of a sheaf, we give a proof of the Mittag-Leffler theorem for vector-valued meromorphic functions on a non-compact Riemann surface to a complete Hausdorff locally semi-convex space.     

The Distortion Theorem for Quasiconformal Mappings, Schottky's Theorem and Holomorphic Motions

We prove the equivalence of Schottky's theorem and the distortion theorem for planar quasiconformal mappings via the theory of holomorphic motions. The ideas lead to new methods in the study of distortion theorems for quasiconformal mappings and a new proof of Teichmüller's distortion theorem.

     

Persistence of laminations

We present a modern proof of some extensions of the well known Hirsch-Pugh-Shub theorem on persistence of normally hyperbolic compact laminations. Our extensions consist of allowing the dynamics to be an endomorphism, the complex analytic case and of allowing the laminations to be non compact. To study the analytic case, we use the formalism of deformations of complex structures. We present various persistent complex laminations which appear in dynamics of several complex variables: Hénon maps, fibered holomorphic maps. In order to prove the persistence theorems,weconstructalaminarstructureonthestableandunstablesetofthenormally hyperbolic laminations.     

On the hyperbolicity of the period-doubling fixed point

We give a new proof of the hyperbolicity of the fixed point for the period-doubling renormalization operator using the local dynamics near a semi-attractive fixed point (in a Banach space) and the theory of holomorphic motions. We also give a new proof of the exponential contraction of the Feigenbaum renormalization operator in the hybrid class of the period-doubling fixed point: our proof uses the non-existence of invariant line fields in the period-doubling tower (C. McMullen), the topological convergence (D. Sullivan), and a new infinitesimal argument.

     

Some new results on domains in complex space with non-compact automorphism group

We provide a new proof of the Wong-Rosay theorem, using the structure of the ring of holomorphic functions. As a byproduct, we provide an analogous theorem for classical bounded symmetric domains. The second main result of this article concerns a new existence theorem for holomorphic peaking functions at a hyperbolic orbit accumulation boundary point. Finally, we give a proof of a version of the Greene-Krantz conjecture using holomorphic vector fields and a strengthened Hopf lemma.     

On the Spectrum of Invertible Semi-hyponormal Operators

It is known that for a semi-hyponormal operator, the spectrum of the operator is equal to the union of the spectra of the general polar symbols of the operator. The original proof of this theorem involves the so-called singular integral model. The purpose of this paper is to give a different proof of the same theorem for the case of invertible semi-hyponormal operators without using the singular integral model.      

Borel complexity and computability of the Hahn–Banach Theorem

The classical Hahn–Banach Theorem states that any linear bounded functional defined on a linear subspace of a normed space admits a norm-preserving linear bounded extension to the whole space. The constructive and computational content of this theorem has been studied by Bishop, Bridges, Metakides, Nerode, Shore, Kalantari Downey, Ishihara and others and it is known that the theorem does not admit a general computable version. We prove a new computable version of this theorem without unrolling the classical proof of the theorem itself. More precisely, we study computability properties of the uniform extension operator which maps each functional and subspace to the set of corresponding extensions. It turns out that this operator is upper semi-computable in a well-defined sense. By applying a computable version of the Banach–Alaoglu Theorem we can show that computing a Hahn–Banach extension cannot be harder than finding a zero in a compact metric space. This allows us to conclude that the Hahn–Banach extension operator is -computable while it is easy to see that it is not lower semi-computable in general. Moreover, we can derive computable versions of the Hahn–Banach Theorem for those functionals and subspaces which admit unique extensions. This work has been partially supported by the National Research Foundation (NRF) Grant FA2005033000027 on “Computable Analysis and Quantum Computing”. An extended abstract version has been published in the conference proceedings [7].     

POINTWISE CONVERGENCE FOR EXPANSIONS IN SPHERICAL MONOGENICS

We offer a new approach to deal with the pointwise convergence of FourierLaplace series on the unit sphere of even-dimensional Euclidean spaces. By using spherical monogenics defined through the generalized Cauchy-Riemann operator, we obtain the spherical monogenic expansions of square integrable functions on the unit sphere. Based on the generalization of Fueter＇s theorem inducing monogenic functions from holomorphic functions in the complex plane and the classical Carleson＇s theorem, a pointwise convergence theorem on the new expansion is proved. The result is a generalization of Carleson＇s theorem to the higher dimensional Euclidean spaces. The approach is simpler than those by using special functions, which may have the advantage to induce the singular integral approach for pointwise convergence problems on the spheres.     

在重力场和磁场影响下自旋刚性航天器的周期运动

考虑重力场和磁场对轴对称航天器本体的影响，研究其质心在圆形轨道上的运动,通过降低系统的运动方程数，并将它变成为一个带电粒子在电磁场作用下的平面运动．确认系统运动是稳定的，并通过Liapunov全纯积分定理，构建其近似的周期运动.     

Yet another proof for a theorem of Landau on Koebe domains

The Koebe domain of a family of functions, holomorphic on the unit disk, is the largest domain that is contained in the image of the unit disk for every function of the family. In this note, we furnish a geometric proof of a classical theorem due to Landau on the Koebe domains for certain families of holomorphic functions. The method of proof involves our recently obtained results concerning estimates for hyperbolic metrics on subdomains.