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We proved:Let F be a family of meromorphic functions in a domain D and a≠0,b∈C.If f′(z)-a(f(z))~2≠b,f≠0 and the poles of f(z)are of multiplicity>=3 for each f(z)∈F,then F is normal in D. 相似文献
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设a(z)是一个没有零点的整函数,k≥3是个整数,F是区域D上的亚纯函数族,对每一个f∈F至少有k重零点和2重极点.若对每一对f,g∈F有ff(k)与gg(k)IM分担a(z),则F在区域D内正规. 相似文献
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本文研究了涉及一类微分多项式的亚纯函数族的正规性问题.利用Zalcman-Pang的方法,得到一个正规定则,推广了2011年袁文俊等得到的结果. 相似文献
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设(ぁ)为区域D上的一族亚纯函数,a,b为互相判虽的两个复数.若对(ぁ)中任意函数f,f在D内的极点重数至少为2,且当f(z)=a时,f'(z)=a;f(z)=b时f'(z)=b,则(ぁ)在D内正规. 相似文献
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《数学的实践与认识》2017,(20)
主要讨论涉及分担值的两个相关亚纯函数族的正规性,推广刘晓俊,李三华和庞学诚关于两族亚纯函数分担4个值的一个结果,给出了两个相关亚纯函数族分担3个值和2个值情况的正规定则. 相似文献
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设k为正整数,M为正数;F为区域D内的亚纯函数族,且其零点重级至少为k;h为D内的亚纯函数(h(z)≠0,∞),且h(z)的极点重级至多为k.若对任意给定的函数f∈F,f与f~((k))分担0,且f~((k))(z)-h(z)=0?|f(z)|≥M,则F在D内正规. 相似文献
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Let F be a family of functions meromorphic in a domain D, let P be a polynomial with either deg P≥3 or deg P = 2 and P having only one distinct zero, and let b be a finite nonzero complex number. If, each pair of functions f and g in F, P (f)f and P (g)g share b in D, then F is normal in D. 相似文献
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This paper investigates the relationship between the normality and the shared values for a meromorphic function on the unit
disc Δ. Based on Marty’s normality criterion and through a detailed analysis of the meromorphic functions, it is shown that if for
every f ∈
, f and f
(k) share a and b on Δ and the zeros of f(z) − a are of multiplicity k ⩾ 3, then
is normal on Δ, where
is a family of meromorphic functions on the unit disc Δ, and a and b are distinct values.
Selected from Journal of East China Normal University (Natural Science), 2003, 4: 12–18. This work was supported by the National Natural Science Foundation of China under grant number 10271122
and by Shanghai City Foundation for selected academic research 相似文献
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WANG Jian-ping 《数学季刊》2005,20(1):42-46
This paper investigate the uniqueness problems for meromorphic functions that share three values CM and proves a uniqueness theorem on this topic which can be used to improve some previous related results. 相似文献
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In this note, we proved a theorem concerning two meromorphic functions that share four values, which generalizes the Nevanlinna’s four-value theorem.AMS Subject Classification (2000): 30D35.Supported by the National Science Foundation of PRC. 相似文献
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孙道椿 《数学物理学报(B辑英文版)》2010,30(1):166-172
By using the definition of Hausdorff distance, we prove some normality criteria for families of meromorphic algebroid functions. Some examples are given to complement the theory in this article. 相似文献
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In this paper, we mainly discuss the normality of two families of functions concerning shared values and proved: Let F and G be two families of functions meromorphic on a domain D■C,a1, a2, a3, a4 be four distinct finite complex numbers. If G is normal, and for every f ∈ F , there exists g ∈ G such that f(z) and g(z) share the values a1, a2, a3, a4, then F is normal on D. 相似文献