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导函数具有最大亏量和的杨乐问题 被引量:1

Yang's problem on derivative functions with maximal deficiency sum
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摘要 设f是复平面上满足∑a∈Cδ(a,f)=2的超级有穷的超越亚纯函数,则对于任意正整数k,有∑a∈Cδ(a,f(k))=21+k(1Θ(∞,f)).于是,导函数亏量和不等式∑a∈Cδ(a,f(k))21+k(1Θ(∞,f))的上界是精确的,回答了杨乐于1990年提出的一个问题. Suppose that f is a transcendental meromorphic function with ∑ a∈ Cδ(a, f) = 2 and k a positive integer. Then ∑ a∈ C δ(a, f(k)) = 2 1 + k(1 Θ(∞, f)). This means that the upper bound of the inequality of deficiency sum ∑ a∈ C δ(a, f(k)) 2 1 + k(1 Θ(∞, f)) is sharp. This result answers a question posed by Lo Yang in 1990.
出处 《中国科学:数学》 CSCD 北大核心 2013年第12期1177-1184,共8页 Scientia Sinica:Mathematica
基金 国家自然科学基金(批准号:11071083和10771076)资助项目
关键词 亚纯函数 亏值 最大亏量和 meromorphic function deficiency value maximal deficiency sum
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参考文献14

  • 1Yang L. Value Distribution Theory. Berlin: Springer-Verlag, 1993.
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二级参考文献14

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