数学

多复变整函数涉及全导数的 Picard 型定理

  • 周胜瑶 ,
  • 杨刘
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  • 安徽工业大学 数理科学与工程学院, 安徽 马鞍山 243032

收稿日期: 2020-08-22

  网络出版日期: 2021-11-26

基金资助

国家自然科学基金(11701006); 安徽省自然科学基金(1808085QA02)

Picard-type theorems for entire functions of several complex variables with total derivatives

  • Shengyao ZHOU ,
  • Liu YANG
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  • School of Mathematics and Physics, Anhui University of Technology, Maanshan Anhui 243032, China

Received date: 2020-08-22

  Online published: 2021-11-26

摘要

本文中, 我们利用多复变对数导数引理将Milloux不等式推广至关于整函数全导数的微分多项式. 作为应用, 我们证明了两个多复变 Picard 型定理: 设 $ f $ $ \mathbb{C}^{n} $ 上的一个整函数, $ a, b $ 是两个判别复数且 $ b\neq 0, $ (1) 如果 $ f\neq a, $ $ f $ 关于全导数的微分多项式 $ {\cal{P}}\neq b, $ $ f $ 是常函数; (2) 如果 $f^{s}D^{t_{1}}(f^{s_{1}})\cdots D^{t_{q}}(f^{s_{q}})\neq $ $ b,$ $ s+\sum_{j = 1}^{q}s_{j}\geqslant 2+\sum_{j = 1}^{q}t_{j}, $ $ f $ 是常函数, 其中 $ D^{k}f $ $ f $ $ k $ 阶全导数.

本文引用格式

周胜瑶 , 杨刘 . 多复变整函数涉及全导数的 Picard 型定理[J]. 华东师范大学学报(自然科学版), 2021 , 2021(6) : 38 -46 . DOI: 10.3969/j.issn.1000-5641.2021.06.005

Abstract

In this paper, we use the logarithmic derivative lemma for several complex variables to extend the Milloux inequality to differential polynomials of entire functions. As an application, we subsequently apply the concept to two Picard-type theorems: (1) Let $ f $ be an entire function in $\mathbb{C}^{n}$ and $a, b\;(\neq 0)$ be two distinct complex numbers. If $ f\neq a, {\cal{P}}\neq b, $ then $ f $ is constant. (2) If $ f^{s}D^{t_{1}}(f^{s_{1}})\cdots D^{t_{q}}(f^{s_{q}})\neq b $ and $ s+ $ $ \sum_{j = 1}^{q}s_{j}\geqslant 2+\sum_{j = 1}^{q}t_{j}, $ then $ f $ is constant, where $ D^{k}f $ is the $ k $ -th total derivative of $ f $ and $ {\cal{P}} $ is a differential polynomial of $ f $ with respect to the total derivative.

参考文献

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