摘要
讨论了微分方程f″+A1eP(z)f′+A0eQ(z)f=0解的增长性,其中P(z)、Q(z)为n(n≥1)次多项式,Aj(z)(Aj(z)≠0;j=0,1)是亚纯函数且σ(Aj)<n.当P(z)和Q(z)的系数满足某些条件时,得到了方程的每个非零解f具有无穷级,并进一步估计了其无穷级解的增长性,得到了其超级的一个下界.
The growth of solutions for differential equations f" + A1 e^P(z)f' + A0e^Q(z)f = 0 is investigated,where P ( z ) , Q(z) are polynomials with degree n (n≥1), and Aj(z) (Aj(z)≠0;j=0,1) are meromorphic functions with σ(Aj) 〈 n. Suppose that the coefficients of P(z) and Q(z) satisfy certain conditions. It is showed that every meromorphic solution f( ≠ 0) of the equations has infinite order. The growth of every infinite solution of the equations is estimated and a lower bound of the hyper - order of the solutions is obtained.
出处
《华南师范大学学报(自然科学版)》
CAS
2007年第1期15-19,共5页
Journal of South China Normal University(Natural Science Edition)
基金
广东省自然科学基金资助项目(04010360)
关键词
微分方程
亚纯函数
级
超级
differential equation
meromorphic function
the order of growth
hyper - order