On meromorphic extendibility

Let D be a bounded domain in the complex plane whose boundary consists of finitely many pairwise disjoint real-analytic simple closed curves. Let f be an integrable function on bD. In the paper we show how to compute the candidates for poles of a meromorphic extension of f through D and thus reduce the question of meromorphic extendibility to the question of holomorphic extendibility. Let A(D) be the algebra of all continuous functions on which are holomorphic on D. We prove that a continuous function f on bD extends meromorphically through D if and only if there is an N∈N∪{0} such that the change of argument of Pf+Q along bD is bounded below by −2πN for all P,Q∈A(D) such that Pf+Q≠0 on bD. If this is the case then the meromorphic extension of f has at most N poles in D, counting multiplicity.     

亚纯单叶函数的Hadamard乘积

设g(ζ)=ζ+sum from n=0 to ∞b_nζ~(-n)为α级亚纯星形函数(0≤α<1,|ζ|>1),函数ψ(z)=z+sum from n=2 to ∞α_nZ~n为单位园内的凸单叶函数。本文得到,若α∈(1/2,1),则g(ζ)※ζ~2ψ(1/ζ)(|ζ|>1)为α级亚纯星形函数,作为这个结果的一个推论,文[4]中的猜测在α∈(1/2,1)内成立。     

A NOTE ON INTERPOLATION OF A CERTAIN CLASS OF FUNCTIONS

ＡＮＯＴＥＯＮＩＮＴＥＲＰＯＬＡＴＩＯＮＯＦＡＣＥＲＴＡＩＮＣＬＡＳＳＯＦＦＵＮＣＴＩＯＮＳ￥ＺＨＵＹＡＯＣＨＥＮ（朱尧辰）（ＩｎｓｔｉｔｕｔｅｏｆＡｐｐｌｉｅｄＭａｔｈｅｍａｔｉｃｓ，ｔｈｅＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅｓ，Ｂｅｉｊ...     

Meromorphic resolvents and power bounded operators

Tools to estimate resolvents are developed and a model result is given for power bounded operators: the dimension showing up in the Kreiss matrix theorem can be replaced by the trace norm.     

分担三个公共值的亚纯函数

主要讨论两个亚纯函数分担三个公共值时的唯一性问题，所得结果改进了仪洪勋、邱淦佛等的相应定理．     

The Growth of Composite Meromorphic Functions

Let f be a transcendental meromorphic function of order $ \rho _f $ , g be a transcendental entire function of lower order $\lambda _g (\lambda _g \lt + \infty ) $ with $ \sum _{a\not = \infty }\delta (a,g)= 1 $ , then $$\overline {\mathop {{\rm lim}}\limits_{r \to \infty } } \log {{\left( {T\left( {r,f\left( g \right)} \right)} \right)} \mathord{\left/{\vphantom {{\left( {T\left( {r,f\left( g \right)} \right)} \right)} {T\left( {r,g} \right)}}} \right. \kern-\nulldelimiterspace} {T\left( {r,g} \right)}} = \pi \rho f.$$     

具有亏值的亚纯函数的唯一性

主要研究具有亏值的亚纯函数的唯一性问题,所得结果推广和改进了H.Ueda及仪洪勋等人的有关结果。     

具有一个分担值的亚纯函数

研究了具有一个分担值的亚纯函数,得到若干唯一性定理。     

Numerical experiments on the condition number of the interpolation matrices for radial basis functions

Through numerical experiments, we examine the condition numbers of the interpolation matrix for many species of radial basis functions (RBFs), mostly on uniform grids. For most RBF species that give infinite order accuracy when interpolating smooth f(x)—Gaussians, sech's and Inverse Quadratics—the condition number κ(α,N) rapidly asymptotes to a limit κasymp(α) that is independent of N and depends only on α, the inverse width relative to the grid spacing. Multiquadrics are an exception in that the condition number for fixed α grows as N². For all four, there is growth proportional to an exponential of 1/α (1/α² for Gaussians). For splines and thin-plate splines, which contain no width parameter, the condition numbers grows asymptotically as a power of N—a large power as the order of the RBF increases. Random grids typically increase the condition number (for fixed RBF width) by orders of magnitude. The quasi-random, low discrepancy Halton grid may, however, have a lower condition number than a uniform grid of the same size.     

涉及零点重数的亚纯函数的值分布

本文研究涉及零点重数的亚纯函数的值分布，证明了几个一般的模分布定理及相应的亚纯函数族的正规定则．     

关于亚纯代数体函数奇异方向的存在性

本文证明了如下结果:对于有穷正级亚纯代数体函数,一定存在一条奇异方向L∶arg z=θ0(0≤θ0＜2π),使得对于任意δ∈(0,π/2),在角域Δ(θ0,δ)内,对任意复数a,对任意ε＞0,有∑i1|zi(a;Δ(θ0,δ))|σ=∞(σ等于ρ或ρ-ε)至多有2v个例外a值.     

Meromorphic functions that share a set with their derivatives

There exists a set S with three elements such that if a meromorphic function f, having at most finitely many simple poles, shares the set S CM with its derivative f^′, then f^′≡f.     

关于亚纯函数的唯一性

设f（z）是非常数亚纯函数,n是正整数,F（z）=,其中aj（z）（j=0,1,2,…,n）均是f（z）的小函数．本文证明了：若f（z）满足N（r,f）=s（r,f）,且f（z）=b1（z）F（z）=b2（z）,这里b1（z）、b2（z）为f（z）的小函数,b1（z）0,b2（z）0,δ（0,f）＞,则或者f·Fb1·b2．     

On Homogeneous Differential Polynomials of Meromorphic Functions

In this paper, we study one conjecture proposed by W. Bergweiler and show that any transcendental meromorphic functions f(z) have the form exp(αz+β) if f(z)f″(z)–a(f′ (z))²≠0, where . Moreover, an analogous normality criterion is obtained. Supported by National Natural Science Foundation and Science Technology Promotion Foundation of Fujian Province (2003)     

q移动差分方程亚纯解的一些性质（英文）

主要讨论了q移动差分方程零级亚纯解的一些性质,所得结果推广及改进了先前陈宗煊和郑秀敏,Korhonen等人的结果.     

Some Theorems on Meromorphic Univalent Functions

In this paper, we will show some deviation theorems and theorems of rotational angles in classes of Σ(p) and Σ(p,q) of meromorphic univalent functions.     

Uniqueness Theorem of Meromorphic Mappings with Moving Targets

Some uniqueness theorems of meromorphic mappings with moving targets are given under the inclusion relations between the zeros sets of meromorphic mappings.     

亚纯函数与它们的导数的唯一性定理

本文主要得到亚纯函数与它们的ｎ阶导数分担某些值时的唯一性的一个一般性定理，推广和改进了Ｓｈｉｂａｚｋｉ．仪洪勋等人的某些结果。     

Meromorphic functions with bounded boundary rotation

In this article, we generalize the class of meromorphic functions with bounded boundary rotation and related classes. Characterizations and some properties of these classes of functions are given.     

Some Results on the Uniqueness of Meromorphic Mappings

The authors study the problem of uniqueness of meromorphic mappings and obtain two results which partially improve two theorems of Yah and Chen in 2006.