JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) ›› 2019, Vol. 54 ›› Issue (4): 17-21.doi: 10.6040/j.issn.1671-9352.0.2018.180

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Normal criteria concerning derivative functions and shared meromorphic functions

  

  1. 1. School of Statistics and Mathematics, Shanghai Lixin University of Accounting and Finance, Shanghai 201620, China;
    2. College of Arts and Sciences, Shanghai Dianji University, Shanghai 201306, China;
    3. College of Electronic and Electrical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
  • Published:2019-04-08

Abstract: Aiming at normal criteria concerning derivative functions and shared meromorphic functions, the result is showed as follows. Let Ω and a(z)(≠0) be a family of functions meromorphic and a meromorphic function in D, respectively. If every μ(z)∈Ω satisfies conditions as follows:(1)μ(z)≠0,(2)for each of the same poles of μ(z) and a(z), the multiplicities in μ(z) are greater than or equal to the multiplicities in a(z),(3)for every functions {μ(z), ν(z)}⊂Ω, μ(m)(z) and ν(m)(z) share a(z), then Ω is normal in D. And two examples are given to verify the necessity of conditions(1)and(2).

Key words: the family of meromorphic functions, shared meromorphic functions, normal criteria

CLC Number: 

  • O174.5
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