与分担值相关的亚纯函数的正规性

On the Normality of Meromorphic Functions Related to Shared Values

设F是区域D内的亚纯函数族,a,b,c,d,k,l是有穷复数,c≠k,b≠d,b≠0,l≠0,F中任意的函数f满足:(1°)若f′=b,则f=a;(2°)若f=c,则f′=d;(3°)若f=k,则f′=l,

Abstract： Let F be a family of meromorphic functions in the area D, a, b, c, d, k and l be finite complexnumbers, and c≠k,b≠d,b≠0,l≠0.If ↓A f∈ F satisfies.（1°）f = a whenever f＇ = b; （2°）f＇ = d whenever f = c; （3°）f＇ = l whenever f = k,then F is normal in D.