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arXiv 0903.3872math.CV
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Picard定理在小超级亚纯函数中的推广

An extension of Picard's theorem for meromorphic functions of small hyper-order

Risto Korhonen

摘要:

证明了Nevanlinna理论的第二个主要定理的一个版本,其中分支项被一个依赖于小超阶亚纯函数的复合算子的项所取代.作为这一结果的推论,证明了:如果超阶小于1/n^2的亚纯函数f的三个不同值关于代数函数t(z)=z+ a_{n-1} z^{1-1/n}+.+的固定分支具有前向不变的原像,则f的前向不变的原像是前向不变的. a_1 z^{1/n}+a_0,则f(t(z))= f(z)。这是小超阶亚纯函数的Picard定理的推广,因为通常Picard例外值的(空)原像是前向不变原像的特殊情况。

英文摘要:

A version of the second main theorem of Nevanlinna theory is proved, where the ramification term is replaced by a term depending on a certain composition operator of a meromorphic function of small hyper-order. As a corollary of this result it is shown that if three distinct values of a meromorphic function f of hyper-order less than 1/n^2 have forward invariant pre-images with respect to a fixed branch of the algebraic function t(z)=z+a_{n-1} z^{1-1/n}+...+a_1 z^{1/n}+a_0 with constant coefficients, then f(t(z)) = f(z) for all z. This is a generalization of Picard's theorem for meromorphic functions of small hyper-order, since the (empty) pre-images of the usual Picard exceptional values are special cases of forward invariant pre-images.

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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