几种奇异方向之间的关系

本文研究了有穷正级代数体函数的几种奇异方向即Julia方向、Borel方向、强Borel方向、T方向、最大型Borel方向之问的关系.利用型函数的性质,得到了它们之间的包含关系.     

关于无限级拟亚纯映射的Borel方向

本文利用型函数、覆盖曲面的方法,讨论了平面上无限级拟亚纯映射的充满圆与Borel方向,得出了充满圆序列决定一条Borel方向,Borel方向上存在充满圆序列.     

拟亚纯映射的最大型Borel方向

作者用几何方法研究了更广泛的K-拟亚纯映射;定义了K-拟亚纯映射的最大型Borel方向;证明了有限正级K-拟亚纯映射最大型Borel方向的存在性;并导出了最大型Borel方向的一个充要条件.     

线性微分方程解在角域内的性质

本文主要研究了线性微分方程f″+A(z)f′+B(z)f=F(z)解的精确级Borel方向的问题.利用熊庆来的无限级型函数和庄圻泰的关于无穷级Borel方向的一个等价条件,获得了方程非齐次项的精确级Borel方向就是方程解的精确级Borel方向的结果,推广了已有的结论.     

关于亚纯函数及其导数的Borel方向

亚纯函数及其导数的Borel方向之间有密切关系,本文运用Nevanlinna理论证明有穷正级亚纯函数f（z）的Borel方向也是f'（z）或（zf（z))'或（z 1）f（z))'的Borel方向.     

代数体函数及其导数的涉及重值的Borel方向

该文研究了有限正级代数体函数涉及重值的Borel方向的存在范围, 并得到了有限正级代数体函数及其导数存在公共的涉及重值的Borel方向的判定方法.     

关于零级亚纯函数的Nevanlinna方向与Borel方向

本文研究了零级亚纯函数Borel方向与Nevanlinna方向的关系.应用Ahlfors覆盖曲面的几何方法,获得了部分零级亚纯函数关于型函数的.Borel方向一定是Nevanlinna方向,而这一结果至今未见有文献研究.     

关于亚纯函数Borel方向的几点注记

设 f(z)为平面内的亚纯函数,其级为λ(0<λ≤+∞),下级为μ(0≤μ<+∞).ρ为一有穷正数,适合条件μ≤ρ≤λ.在文献[1]中,杨乐对这种亚纯函数引入了ρ级 Borel方向的概念 并且还讨论了其分布问题.对于整函数的情形,这种 Borel 方向在文献[2]中得到了研究.讨论这种下级有穷的 Borel 方向是比以往讨论有穷正级的 Borel 方向更为广泛的一类问题.根据杨乐和张广厚[3]中的结论,具有这种ρ级 Borel 方向的亚纯函数是广泛存在的.在本文中我们得到了两个结果,其中定理1是文[2]中主要结果的推广,但证明非常简单,定理2是 Milloux 关于整函数与其导数的公共 Borel 方向的结果的推广.     

拟亚纯映射的最大型Borel方向

本文得到下列结果:(1)有穷正级K-拟亚纯映射存在最大型Borel方向;(2)有穷正级K-拟亚纯映射最大型Borel方向上存在充满圆序列.     

复振荡中的辐角分布

利用熊庆来的无限级型函数和庄圻泰的关于无限级Borel方向的一个等价条件,建立了二阶和高阶微分方程解的零点聚值线和Borel方向之间的关系.所得结论推广了伍胜健等人的结果.     

单位圆内零级代数体函数的强Borel点

主要讨论了单位圆内零级代数体函数在满足某条件下的强Borel点存在性问题,通过建立单位圆内零级代数体函数满足此条件的型函数的关系式,证明得到了单位圆内零级代数体函数在此条件下必存在强Borel点,且其强Borel点必是其Borel点.     

关于无穷级代数体函数Borel方向的定理

本文研究了无穷级代数体函数Borel方向的判定问题.利用代数体函数的一个基本不等式,获得了一个关于无穷级代数体函数Borel方向的判定定理,将李国平关于无穷级半纯函数的聚值线判定定理推广到了无穷级代数体函数.     

On the Value Distribution of an Algebroid Function of Infinite Order

In this paper, we first give a fundamental inequality of algebroid functions, then using it we prove that for any x -valued algebroid functions of infinite order in the plane, there exists a sequence of filling disks and Borel direction of dealing with its multiple values, such that the number of Borel exceptional values is equal to 2ν at most.     

The Borel directions of algebroidal function and its coefficient functions

In this article, the relationship between the Borel direction of algebroidal function and its coefficient functions is studied for the first time. To begin with, several theorems of algebroidal functions in unit disk are proved. By these theorems, some interesting conclusions are obtained.     

THE BOREL DIRECTIONS OF ALGEBROIDAL FUNCTION AND ITS COEFFICIENT FUNCTIONS

In this article, the relationship between the Borel direction of algebroidal function and its coefficient functions is studied for the first time. To begin with, several theorems of algebroidal functions in unit disk are proved. By these theorems, some interesting conclusions are obtained.     

拟亚纯映射的Borel方向

对于平面上的Ｋ－拟亚纯映射时,建立了一个角域的基本不等式,由此证明了Ｋ－拟亚纯映射的Ｂｏｒｅｌ方向的存在性及其相应性质。     

ON NEVANLINNA DIRECTIONS OF ALGEBROID FUNCTIONS

In this paper, a notation δχ(ω) is derived from the counting function Nχ(r,w) of branch points of algebriod functions. With this notation, the authors give the definition of the Nevanlinna direction for algebriod functions and discuss its existence in certain condition. By this notation the authors also obtain the numbers of exceptional value of the Julia direction and Borel direction of algebriod functions are not more than 2 [δχ(ω)],here [x] implies an maximum integer number which does not exceed x.     

Borel方向与涉及重值的亚纯函数的唯一性

利用角域Nevanlinna特征函数和亚纯函数的辐角分布理论研究了亚纯函数的角域唯一性问题,获得了一些涉及重值的角域唯一性的结果,该角域包含亚纯函数的一条Borel方向.     

Effective Borel measurability and reducibility of functions

The investigation of computational properties of discontinuous functions is an important concern in computable analysis. One method to deal with this subject is to consider effective variants of Borel measurable functions. We introduce such a notion of Borel computability for single‐valued as well as for multi‐valued functions by a direct effectivization of the classical definition. On Baire space the finite levels of the resulting hierarchy of functions can be characterized using a notion of reducibility for functions and corresponding complete functions. We use this classification and an effective version of a Selection Theorem of Bhattacharya‐Srivastava in order to prove a generalization of the Representation Theorem of Kreitz‐Weihrauch for Borel measurable functions on computable metric spaces: such functions are Borel measurable on a certain finite level, if and only if they admit a realizer on Baire space of the same quality. This Representation Theorem enables us to introduce a realizer reducibility for functions on metric spaces and we can extend the completeness result to this reducibility. Besides being very useful by itself, this reducibility leads to a new and effective proof of the Banach‐Hausdorff‐Lebesgue Theorem which connects Borel measurable functions with the Baire functions. Hence, for certain metric spaces the class of Borel computable functions on a certain level is exactly the class of functions which can be expressed as a limit of a pointwise convergent and computable sequence of functions of the next lower level. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)