摘要
文[4]对简单形式的微分多项式fkf’+a的零点分布进行了讨论,文[1]对一般形式的微分多项式fkQ[f]+P[f]的零点分布进行了讨论.但由于极点给证明带来的困难,这些工作主要是对整函数来做的.本文证明了任一满足δ(∞,f)>k+2ΓQ+3ΓP+2/2k+2ΓQ+1的超越亚纯函数f,微分多项式fkQ[f]+P[f]在不含f,Q[f]极点和P[f]零、极点的可数个圆盘并集之外有无穷多个零点,其中k≥3Γp+2,而ΓQ,ΓP分别是f的微分多项式Q[f],P[f]的权.文[1]和[2,4,6]中的结论是本文结论的特殊情况.
The distribution of zeros for differential polynomials fkf'+ a and fkQ[f] + P[f] has been studied in [4] and [1]. There are some difficulties in proving zeros distribution of differential polynomials because of the presence of poles. So the above results are only for entire functions. In this paper, we prove that for a transcendental meromorphic function f and two differential polynomials Q[f], P[f] of f, fkQ[f] + P[f] has infinitely many zeros outside the union of the disce which do not contain the poles of f,Q[f], P[f] and the zeros of P[f]. Where f satisfies δ(∞, f) >and P are weights of Q[f] and P[f]. The result improves that of [1] and [2,4,6].
出处
《数学学报（中文版）》
SCIE
CSCD
北大核心
2003年第2期237-244,共8页
Acta Mathematica Sinica：Chinese Series
基金
湖南省教育厅基金资助项目
关键词
整函数
亚纯函数
微分多项式
ε集
Entire function
Meromorphic function
Differential polynomial
ε set
