亚纯函数及其导函数的特征函数

Characteristic Function of Meromorphic Function and Its Derivative

证明了如下结果：设ｆ（ｚ）是开平面上的有穷级亚纯函数，满足，这里ａ（ｚ）是开平面上的亚纯函数满足Ｔ（ｒ，ａ（ｚ））＝ｏ｛Ｔ（ｒ，ｆ）｝，且对于一正整数，则对任意正整数ｇ有．

The following theorem was proved: Let f(z) be a meromorphic function of finite order,If , where a (z) satisfies T(r,a (z) ) = =o {T(r,f) },a (x )and there exists a posititive integer k which satisifies k N(r,f)-N (r, f)= o {T (r ,f) }, thenfor any positive integer g. we have