Mathematics – Complex Variables
Scientific paper
2011-11-03
Mathematics
Complex Variables
Scientific paper
We prove that if D is a domain in C, alpha>1 and c>0, then the family F of
functions meromorphic in D such that |f'(z)|/(1+|f(z)|^alpha)>c for every z in
D is normalin D. For alpha=1, the same assumptions imply quasi-normality but
not necessarily normality.
Liu Xiaojun
Nevo Shahar
Pang XueCheng
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