Periodic points and normal families concerning multiplicity

doi:10.1007/s11425-016-9185-4

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	Periodic points and normal families concerning multiplicity
	Deng, Bingmao 1; Fang, Mingliang 1; Wang, Yuefei2,3
	2019-03-01
发表期刊	SCIENCE CHINA-MATHEMATICS
ISSN	1674-7283
卷号	62 期号:3 页码:535-552
摘要	In 1992, Yang Lo posed the following problem: let F be a family of entire functions, let D be a domain in C, and let k 2 be a positive integer. If, for every f F, both f and its iteration f(k) have no fixed points in D, is F normal in D? This problem was solved by Essen and Wu in 1998, and then solved for meromorphic functions by Chang and Fang in 2005. In this paper, we study the problem in which f and f(k) have fixed points. We give positive answers for holomorphic and meromorphic functions.Let F be a family of holomorphic functions in a domain D and let k 2 be a positive integer. If, for each f F, all zeros of f(z) - z are multiple and f(k) has at most k distinct fixed points in D, then F is normal in D. Examples show that the conditions all zeros of f(z) - z are multiple and f(k) having at most k distinct fixed points in D are the best possible.Let F be a family of meromorphic functions in a domain D, and let k 2; l be two positive integers satisfying l 4 for k = 2 and l 3 for k 3. If, for each f F, all zeros of f(z) - z have a multiplicity at least l and f(k) has at most one fixed point in D, then F is normal in D. Examples show that the conditions l 3 for k 3 and f(k) having at most one fixed point in D are the best possible.
关键词	normality iteration periodic points 35D45
DOI	10.1007/s11425-016-9185-4
语种	英语
资助项目	National Natural Science Foundation of China[11371149] ; National Natural Science Foundation of China[11231009] ; Graduate Student Overseas Study Program from South China Agricultural University[2017LHPY003]
WOS研究方向	Mathematics
WOS类目	Mathematics, Applied ; Mathematics
WOS记录号	WOS:000457383300006
出版者	SCIENCE PRESS
引用统计
文献类型	期刊论文
条目标识符	http://ir.amss.ac.cn/handle/2S8OKBNM/32442
专题	数学所
通讯作者	Fang, Mingliang
作者单位	1.South China Agr Univ, Inst Appl Math, Guangzhou 510642, Guangdong, Peoples R China 2.Chinese Acad Sci, Acad Math & Syst Sci, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Sch Math Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Deng, Bingmao,Fang, Mingliang,Wang, Yuefei. Periodic points and normal families concerning multiplicity[J]. SCIENCE CHINA-MATHEMATICS,2019,62(3):535-552.
APA	Deng, Bingmao,Fang, Mingliang,&Wang, Yuefei.(2019).Periodic points and normal families concerning multiplicity.SCIENCE CHINA-MATHEMATICS,62(3),535-552.
MLA	Deng, Bingmao,et al."Periodic points and normal families concerning multiplicity".SCIENCE CHINA-MATHEMATICS 62.3(2019):535-552.