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arXiv math/0506011math.CVnlin.SI
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差分算子的Nevanlinna理论

Nevanlinna theory for the difference operator

R. G. Halburd, R. J. Korhonen

摘要:

亚纯函数的导数$f\mapsto f'$的某些估计在经典Nevanlinna理论的构造和应用中起着关键作用。本研究的目的是将通常的Nevanlinna理论推广到精确差$f\mapsto Δf=f(z+c)-f(z)$的理论。一个亚纯函数$f$的$a$ -点称为在$z\in\C$上$c$ -配对,如果对固定常数$c\in\C$有$f(z)=a=f(z+c)$.本文研究了有限级亚纯函数配对点的分布。其中一个主要结果是一个模拟的第二个主要定理的Nevanlinna理论,其中通常的分歧长期被取代的数量表示的配对点的$f$。该定理的推论包括类似的Nevanlinna亏损关系,Picard定理和Nevanlinna五值定理。差分方程的应用进行了讨论,并给出了一些例子,说明使用和锋利的结果。

英文摘要:

Certain estimates involving the derivative $f\mapsto f'$ of a meromorphic function play key roles in the construction and applications of classical Nevanlinna theory. The purpose of this study is to extend the usual Nevanlinna theory to a theory for the exact difference $f\mapsto Δf=f(z+c)-f(z)$. An $a$-point of a meromorphic function $f$ is said to be $c$-paired at $z\in\C$ if $f(z)=a=f(z+c)$ for a fixed constant $c\in\C$. In this paper the distribution of paired points of finite-order meromorphic functions is studied. One of the main results is an analogue of the second main theorem of Nevanlinna theory, where the usual ramification term is replaced by a quantity expressed in terms of the number of paired points of $f$. Corollaries of the theorem include analogues of the Nevanlinna defect relation, Picard's theorem and Nevanlinna's five value theorem. Applications to difference equations are discussed, and a number of examples illustrating the use and sharpness of the results are given.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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