Borel and Julia directions of meromorphic Schröder functions

Borel and Julia directions of meromorphic Schröder functions
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DOI:
10.1017/s0305004105008492
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发表时间:
2005-06
影响因子:
0.8
通讯作者:
K. Ishizaki;N. Yanagihara
K. Ishizaki;N. Yanagihara
中科院分区:
数学2区
文献类型:
--
作者:
K. Ishizaki;N. Yanagihara

文献摘要

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Schröder方程$f(sz)\,{=}\,R(f(z)),$的亚纯解|S|研究了$R(w)$是具有$deg[R]\,{\geq}\,2 $的有理函数的情形.我们将证明,如果$\arg[s]\notin 2\pi {\mathbb Q}$,则$f(z)$有任何Borel方向,除了Picard值之外没有其他例外值,这些值取决于$R(w)$。此外,还考虑了$\arg[s]\,{\in}\,2\pi {\mathbb Q}$的情况。研究了f(z)的Julia方向与R(w)的Julia集之间的关系.
Meromorphic solutions of the Schröder equation $f(sz)\,{=}\,R(f(z)),$ where $|s|\,{>}\,1$ and $R(w)$ is a rational function with $\deg[R]\,{\geq}\,2$, are studied. We will show that, if $\arg[s]\notin 2\pi {\mathbb Q}$, then $f(z)$ has any Borel direction, without exceptional values other than Picard values, which depend on $R(w)$. Further the case $\arg[s]\,{\in}\,2 \pi {\mathbb Q}$ is also considered. We investigate the relation between Julia directions of $f(z)$ and the Julia set of $R(w)$.