摘要
设k∈N,f(z)为复平面上的超越亚纯函数,φ(z)、ak-1(z),…,a0(z)为f(z)的小函数,且φ(z)0.置P(f)(z)=f(k)(z)+ak-1(z)f(k-1)(z)+…+a1(z)f′(z)+a0f(z),且P(f)(z)不恒为常数.当k 4时,满足Nk)(r,1f)=S(r,f);k 5时,满足N4)(r,1f)=S(r,f),则T(r,f)<20N-(r,φfP1-1)+S(r,f).
let k be any positive integer and f(z) be a transcendental meromorphic function in the complex plane. Suppose that ,φ(z)、ak-1(z),…,a0(z) are meromorphic functions in the complex plane satisfying T ( r, φ) = S (r,f),T(r,ai)=S(r,f)(i=0,1,…,k-1) and φ(z) does not vanish. Let P(f)(z)=f^(k)(z)+ak-1(z),f^(k-1)(z)+…+a1(z)f(z)+a0,(z) not be a constant. Assume that when k≤4 , Nk)y ( r,1/f) = S(r,f) and when k≥5 N4)(r,1/f) = S(r,f). Then T(r,f)〈20N^-(r,1/φfP- 1)) + S(r,f).
出处
《成都信息工程学院学报》
2007年第6期750-753,共4页
Journal of Chengdu University of Information Technology
关键词
超越亚纯函数
零点
微分多项式
小函数
transcendental meromorphic function
zero
differential polynomial
small function