J. Aust. Math. Soc.  74 (2003), 155-164
On normal families of meromorphic functions

Yan Xu
  Department of Mathematics
  Nanjing Normal University
  Nanjing 210097
  P. R. China
  yanxu@email.njnu.edu.cn
and
Mingliang Fang
  Department of Mathematics
  Nanjing Normal University
  Nanjing 210097
  P. R. China
  mlfang@pine.njnu.edu.cn


Abstract
In this paper we obtain some normality criteria of families of meromorphic functions, which improve and generalize the related results of Gu and Bergweiler, respectively. Some examples are given to show the sharpness of our results.
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