Dimensions of Julia Sets of Hyperbolic Entire Functions

It is known that, if f is a hyperbolic rational function, thenthe Hausdorff, packing and box dimensions of the Julia set J(f)are equal. It is also known that there is a family of hyperbolictranscendental meromorphic functions with infinitely many polesfor which this result fails to be true. In this paper, new methodsare used to show that there is a family of hyperbolic transcendentalentire functions f_K, K N, such that the box and packing dimensionsof Jf_K are equal to two, even though as K the Hausdorff dimensionof Jf_K tends to one, the lowest possible value for the Hausdorffdimension of the Julia set of a transcendental entire function.2000 Mathematics Subject Classification 30D05, 37F10, 37F15,37F35, 37F50.     

The Hausdorff Dimension of Julia Sets of Meromorphic Functions II

A family of transcendental meromorphic functions, f_p(z), p N is considered. It is shown that, if p 6, then the Hausdorffdimension of the Julia set of f_p satisfies dim J(f_p) 1/p, for0 < < 1/6^p, and dim J(f_p) 1–(30 ln ln p/ln p),for p^4p–1/10⁵ ln p < < p^4p–1/10⁴ ln p. Theseresults are used elsewhere to show that, for each d (0, 1),there exists a transcendental meromorphic function for whichdim J(f) = d.     

超整函数族Julia集的Hausdorff维数

Stallard曾经用一族特殊的整函数说明了:超越整函数的Julia集的Hausdorff维数可以无限接近1.本文证明了该函数族的随机迭代的Julia集的Hausdorff维数也可无限接近于1.另一方面,对任意自然数M及任意实数d∈(1,2),本文给出了M个元素的整函数族其随机迭代的Julia集的Hausdorff维数等于d.     

The Scenery Flow for Hyperbolic Julia Sets

We define the scenery flow space at a point z in the Julia setJ of a hyperbolic rational map T : C C with degree at least2, and more generally for T a conformal mixing repellor. We prove that, for hyperbolic rational maps, except for a fewexceptional cases listed below, the scenery flow is ergodic.We also prove ergodicity for almost all conformal mixing repellors;here the statement is that the scenery flow is ergodic for therepellors which are not linear nor contained in a finite unionof real-analytic curves, and furthermore that for the collectionof such maps based on a fixed open set U, the ergodic casesform a dense open subset of that collection. Scenery flow ergodicityimplies that one generates the same scenery flow by zoomingdown towards almost every z with respect to the Hausdorff measureH^d, where d is the dimension of J, and that the flow has a uniquemeasure of maximal entropy. For all conformal mixing repellors, the flow is loosely Bernoulliand has topological entropy at most d. Moreover the flow atalmost every point is the same up to a rotation, and so as acorollary, one has an analogue of the Lebesgue density theoremfor the fractal set, giving a different proof of a theorem ofFalconer. 2000 Mathematical Subject Classification: 37F15, 37F35, 37D20.     

亚纯函数的例外集

亚纯函数的例外集问题的已有结论,还未触及例外集内含有极点的情形.本文证明了对于满足δ(∞,f)>0的超越亚纯函数f(z),设F=fk则F′的可数个圆盘并集之外取任何非零有穷复数无穷次,或者取∞无穷次,本文推广了Hayman,Andersom等人的结论.     

亚纯函数的例外集

自从Ｌｅｈｔｏ Ｏ．［１］提出例外集的概念后,这方面已有不少工作,但这些工作基本上是局限于整函数来做的,主要原因是极点给证明带来很大困难．本文证明了任一个满足δ（∞,ｆ）＞３／４的超越亚纯函数ｆ（ｚ）,ｆｋＱ［ｆ］在任一不含ｆ和Ｑ［ｆ］极点的可数个圆盘并集之外取任何非零复数无穷次,其中ｋ≥１５／８＋１／２ГＱ,ГＱ是ｆ的微分多项式 Ｑ［ｆ］的权．本文的结果推广了 Ｈａｘｍａｎ等人的结论．     

Julia Sets of Certain Exponential Functions

We characterize the Julia sets of certain exponential functions. We show that the Julia sets J(F_λn) of F_λn(z) = λ_ne^zn where λ_n > 0 is the whole plane , provided that lim_k → ∞ F^k_λn(0) = ∞. In particular, this is true when λ_n are real numbers such that . On the other hand, if , then J(F_λn) is nowhere dense in and is the complement of the basin of attraction of the unique real attractive fixed point of F_λn. We then prove similar results for the functions[formula] where λ_i    − {0}, 1 ≤ i ≤ n + 1, a_j > 1, 1 ≤ j ≤ n, and m, n ≥ 1.     

具有两个公共值集的亚纯函数

本文讨论了亚纯函数的唯一性问题，　证明了存在一个具有８个元素的集合Ｓ，使得对任何两个非常数亚纯函数　ｆ与ｇ，只要满足　Ｅ（Ｓ，ｆ）＝Ｅ（Ｓ，ｇ）　　和Ｅ（｛∞｝，ｆ）＝Ｅ（｛∞｝，ｇ）　　，必有ｆ　　ｇ　　．     

Meromorphic Functions That Share Three Sets

In this paper we study the problem of meromorphic functions sharing three sets and obtain some theorems which are the extension and complement of some known relative results given by Yi Hongxun and others.     

具有三个公共值集的亚纯函数

In this paper we study the problem of meromorphic functions sharing three sets and obtain some theorems which are the extension and complement of some known relative results given by Yi Hongxun and others.     

分担集合的亚纯函数的正规性*

本文研究了亚纯函数及其 k 阶导数分担两个不同集合的亚纯函数族的正规性问题.证明了如下结论: 设 F 是平面区域 D上的亚纯函数族, 其中函数的零点重数至少为 k+1. 设S₁, S₂是两个集合,且|S₁|=m, |S₂|=n, S₂ ≠ 0, 这里m, n是正整数. 如果任意f(z) ∈ F,满足f(z) ∈ S₁?f^(k)(z) ∈ S₂, z ∈ D, 则 F 在区域 D 上正规.本文的研究结果是对刘晓俊和庞学诚[刘晓俊, 庞学诚. 分担值与正规族 [J].数学学报(中文版),2007, 50(2):409--412] 2007年研究结果的改进.     

分担函数集的正规定则

本文将亚纯函数正规性与分担函数集相结合,探讨了亚纯函数族F正规与F中任意两个函数f与g分担函数的个数,f与其导数f'分担函数的个数及函数f的重值的个数三者之间的关系,给出了一个综合判定亚纯函数族正规的充分条件.     

分担集合的亚纯函数正规族

对复平面C的非空有限子集S_1和S_2,记在复平面区域D内满足{z∈D:f(z)∈S_1}={z∈D:f′(z)∈S_2}的全体亚纯函数f形成的函数族为D,那么当S_1和S_2共有至少12个元素对函数族D正规.特别地,当S_1具有至少三个复数时,我们得到了准确的结果.     

Ergodic Properties and Julia Sets of Weierstrass Elliptic Functions

 We discuss properties of the Julia and Fatou sets of Weierstrass elliptic ℘ functions arising from real lattices. We give sufficient conditions for the Julia sets to be the whole sphere and for the maps to be ergodic, exact, and conservative. We also give examples for which the Julia set is not the whole sphere. Received September 4, 2001; in revised form March 26, 2002     

Ergodic Properties and Julia Sets of Weierstrass Elliptic Functions

 We discuss properties of the Julia and Fatou sets of Weierstrass elliptic ℘ functions arising from real lattices. We give sufficient conditions for the Julia sets to be the whole sphere and for the maps to be ergodic, exact, and conservative. We also give examples for which the Julia set is not the whole sphere.     

The Fatou and Julia Sets of Multivalued Analytic Functions

We propose a generalization of some problems of complex dynamics which includes the study of iterations of multivalued functions and compositions of various single-valued functions. We generalize two classical results concerning the Julia set.     

具有两个IM公共值集的亚纯函数

本文讨论了亚纯函数的唯一性问题,证明了存在一个具有13个元素的集合S使得对任意两个非常数的亚纯函数f与g,只要满足E(S,f)=E(S,g)和E({∞),f)=E({∞},g),必有f≡g.     

The Hausdorff Dimension of Julia Sets of Entire Functions IV

It is known that, for a transcendental entire function f, theHausdorff dimension of J(f) satisfies 1 dimJ(f) 2. For eachd (1, 2), an example of a transcendental entire function fwith dimJ(f) = d is given. It is then indicated how this functioncan be modified to produce a transcendental meromorphic functionF with one pole with dimJ(F) = d. These appear to be the firstexamples of Julia sets with non-integer dimensions whose dimensionshave been calculated exactly.     

Uniqueness Theorems for Meromorphic Functions That Share Three Sets

In this article, we deal with the problem of uniqueness of meromorphic functions that share three sets, and obtain one set S with 5 elements such that any two nonconstant meromorphic functions ? and g satisfying E(S, ?) = E(S, g), E({0}, ?) = E({0}, g) and E({∞}, ?) = E({∞}, g) must be identical.