UNIQUENESS OF MEROMORPHIC FUNCTIONS WHOSE NONLINEAR DIFFERENTIAL POLYNOMIALS SHARE ONE VALUE OR HAVE THE SAME FIXED POINTS IN AN ANGULAR DOMAIN

In this article, we study the uniqueness question of nonconstant meromorphic functions whose nonlinear differential polynomials share 1 or have the same fixed points in an angular domain. The results in this article improve Theorem 1 of Yang and Hua [26], and improve Theorem 1 of Fang and Qiu [6].     

亚纯函数在不具有奇异方向的角域内的取值

本文证明如果亚纯函数在某个角域内无某种Julia型奇异方向，则该亚纯函数在这个角域内取某些值的次数不会太多．     

权分担一个值的亚纯函数的唯一性

本文研究了亚纯函数关于微分多项式权分担一个值的唯一性问题.利用权分担值的思想,获得了一个亚纯函数唯一性定理,完善了Bhoosnurmath和Dyavanal所得的结果.     

关于亚纯函数唯一性的一些结果

本文研究了涉及重值的具有四个公共小函数的亚纯函数的唯一性问题.利用关于小函数的Nevanlinna第二基本定理精简形式及处理小函数的有关方法,改进了有关结果.利用Gundersen处理公共值对的方法,对具有五个IM公共值对和四个IM公共小函数对的亚纯函数的情况作了进一步讨论,推广改进了相关结果.     

亚纯函数的幅角分布及其增长性

本文考虑了亚纯函数的幅角分布及其增长性的关系，得到了如下定理：设ｆ（ｚ）为亚纯函数，下级μ（μ〈＋∞，ａｒｇｚ＝θｋ（ｋ＝１，２，…，ｑ；０≤θ１〈θ２〈…〈θｑ〈２π，θｑ＋１＝θ１＋２π）为ｑ（１≤ｑ〈＋∞）条半直线使对Ａ↓ε〉０有：ｌｉｍｒ→∞↑－ｌｏｇ＋ｎ↑－（∪ｋ＝１↑ｑΩ↑－（θｋ＋ε，θｋ＋１－ε；ｒ），ｆ＝ｘ）／ｌｏｇｒ≤ρ〈＋∞ ｘ＝０，∞则当存在一非负整数ｌ使ｆ＾（ｌ）（ｚ）（     

UNIQUENESS AND VALUE DISTRIBUTION ON DIFFERENCE POLYNOMIALS OF MEROMORPHIC FUNCTIONS

In this paper, we study the value distribution question of certain difference polynomials of meromorphic functions, and investigate the uniqueness questions of meromorphic functions whose certain difference polynomials share a small functions. The results in this paper improve and extend the corresponding results in Zhang [16] and Chen [1].     

亚纯函数在角域内的波莱耳方向

Suppose that f(z) is a meromorphic function of order λ(0<λ≤∞) and of lower order μ(0≤μ<∞) in the plane. Let ρ(μ≤ρ≤λ) be a finite positive number. B: arg z=θ₀(0≤θ₀ <2π) is called a Borel direction of order ρ of f(z), if for any complex number a, the equality holds, except at most for some a belonging to a set of linear measure zero. For the exceptional values a, we have ρ(θ₀, a)>ρ, except two possible values. With the above hypotheses on f(z), λ, μ and ρ, We have the following lemmas. Lemma 1. There exists a sequence of positive numbers (r_n) such that(?)=∞ and that Lemma 2. If f(z) has a deficient value a₀ with deficiency δ(a₀, f), then we have where (r_n) is the sequence defined in the Lemma 1 and when a_0=∞, we have to replace(?)by (?) in the left hand side of (*). Lemma 3. Suppose that B_1 : arg z =θ₁ and B₂ : arg z=θ₂ (0≤θ₁<θ₂<2π+θ₁) are two half straight lines from the origin and there are no Borel directions of order≥ρ(ρ>1/2) of f(z) in θ₁₀, the inequality holds as n is sufficiently large, where K₁ is a positive number not depending on n andεand when a₀=∞, it is necessary to replace we have θ₂-θ₁≤π/ρ. Theorem 1. Suppose that f(z) is a meromorphic function of order λ (1/2<λ≤+∞) and of lower order μ(0≤μ<+∞) in the plane. Let p be a number such that μ≤ρ≤λ and that 1/2<ρ<+∞If f~((k))(z) has p(1≤P<+∞) deficient values a_i (i=1,2,…,p) with deficiencies δ(a_i,f^(k)), then f(z) has a Borel direction of order ≥ρ in any angular domain, the magnitude of which is larger than It is convenient to consider Julia directions as Borel directions of order zero.Under this assumption, We have the following. Theorem 2. Suppose that f(z) is a meromorphic function of order λ and of finite lower order μ in the plane and that ρ(μ≤ρ≤λ) is a finite number. If p denotes the number of deficient values of f(z) and q denotes the number of Borel directions of order ≥p of f(z), then we have p≤q.     

UNIQUENESS RESULTS OF MEROMORPHIC FUNCTIONS WHOSE DERIVATIVES SHARE FOUR SMALL FUNCTIONS

We prove an oscillation theorem of two meromorphic functions whose derivatives share four values IM. From this we obtain some uniqueness theorems, which improve the corresponding results given by Yang [16] and Qiu [10], and supplement results given by Nevanlinna [9] and Gundersen [3, 4]. Some examples are provided to show that the results in this paper are best possible.     

UNIQUENESS OF DIFFERENCE POLYNOMIALS OF MEROMORPHIC FUNCTIONS

In this article, we investigate the uniqueness problems of difference polynomials of meromorphic functions and obtain some results which can be viewed as discrete analogues of the results given by Shibazaki. Some examples are given to show the results in this article are best possible.     

具"2IM+1CM"公共值的亚纯函数的唯一性

本文主要研究两个亚纯函数具有“2IM＋1CM”公共值的唯一性问题,推广并改进了H.Ueda仪供勋,叶寿桢及作者本人的一系列结果。     

亚纯函数及其k阶导数的唯一性

本文研究具有特殊亏量关系的亚纯函数与其k阶导数分担小函数集合的唯一性，改进，推广了李江涛，顾永兴，杨重骏，仪洪勋等人的有关结果.     

关于亚纯函数的唯一性问题

本文应用 Ｎｅｖａｎｌｉｎｎａ理论研究亚纯函数的重值与唯一性问题,所得结果推广了某些已知的定理,并回答了Ｃ．Ｃ．Ｙａｎｇ的一个猜测．     

具三个公共值的亚纯函数的唯一性

主要讨论了具有三个公共值的亚纯函数的唯一性问题，推广了仪洪勋、叶寿桢与邱淦Ｄｉ等人的有关结果。     

亚纯函数分担三个值

本文研究了具有三个CM公共值的亚纯函数.利用函数组,证明了一个唯一性定理,推广并改进了G.Brosch,H.Ueda等人的结果.     

关于亚纯函数的正规族

在本文研究了亚纯函数族的正规族问题,利用Zalcman引理的方法,获得了亚纯函数族的几个正规定则.并改进了顾永兴和Bergweiler的结果.     

AN INEQUALITY ON THE ZEROS AND POLES OF VECTOR VALUED MEROMORPHIC FUNCTIONS

The author proves that if f : C→Cn is a transcendental vector valued meromorphic function of finite order and assume Σa∈Cn ∪{∞}δ(a) = 2, then,where .This result extends the related results for meromorphic function by Singh and Kulkarni.     

ON CERTAIN CLASS OF MEROMORPHIC FUNCTIONS WITH POSITIVE COEFFICIENTS

In the present investigation we define a new class of meromorphic functions on the punctured unit disk △*:= {z ∈ C : 0 < |z| < 1} by making use of the generalized Dziok-Srivastava operator H l m [α1 ]. Coefficient inequalities, growth and distortion inequalities, as well as closure results are obtained. We also establish some results concerning the partial sums of meromorphic functions and neighborhood results for functions in new class.     

涉及齐次微分多项式的亚纯函数的唯一性

本文证明了下述定理：设f是复平面内一个非常数的亚纯函数，H(f,f′,…，f^m)表示关于f的次数m≥2，的齐次微分多项式，再设a和b是f的两个判别的有穷小函数，如果f^m=a=(f,f′，…f^m)=a并且f^m=b=H(f,f′，…f^m)=b,那么f^m=H(f,f′,…f^m)，上述定理改进了L.A.Rubel and C.C.Yang[1],顾永兴[2]和方明亮[3]中的有关结果。     

涉及微分多项式的亚纯函数的正规族

本文通过研究亚纯函数的正规族.利用反证法,获得了一个与分担值有关的涉及微分多项式的一般性的正规定则,改进了方明亮和L.Zalcman在2002年得到的一个结果.     

无穷级亚纯函数及其导函数的特征函数

本文证明了如下定理：设f(x)为无穷级亚纯函数,如果∑a≠∞δ（a,f)=α（α≥1),δ（∞,f)=2-α,k∈N。则（i)T9r,f^(k)-((1-k) kα）T(r,f)(r→∞）;（ii）当δ^l)0(∞,f)=1时,T（r,f^(k)-T(r,f)(r→∞）。所得定理推广了杨连中的一个结果。