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机构地区:[1]Department of Mathematics, Shandong University, Shandong 250100, China [2]Department of Mathematics, Chongqing University, Chongqing 400044, China
出 处:《Applied Mathematics(A Journal of Chinese Universities)》2006年第3期335-342,共8页高校应用数学学报(英文版)(B辑)
基 金:The first author is supported in part by the Post Doctoral Fellowship at Shandong University.The second author is supported by the national Nature Science Foundation of China (10371065).
摘 要:Let F be a family of holomorphic functions in a domain D, k be a positive integer, a, b(≠0), c(≠0) and d be finite complex numbers. If, for each f∈F, all zeros of f-d have multiplicity at least k, f^(k) = a whenever f=0, and f=c whenever f^(k) = b, then F is normal in D. This result extends the well-known normality criterion of Miranda and improves some results due to Chen-Fang, Pang and Xu. Some examples are provided to show that our result is sharp.Let F be a family of holomorphic functions in a domain D, k be a positive integer, a, b(≠0), c(≠0) and d be finite complex numbers. If, for each f∈F, all zeros of f-d have multiplicity at least k, f^(k) = a whenever f=0, and f=c whenever f^(k) = b, then F is normal in D. This result extends the well-known normality criterion of Miranda and improves some results due to Chen-Fang, Pang and Xu. Some examples are provided to show that our result is sharp.
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