机构地区: 中国科学院数学与系统科学研究院数学研究所
出 处: 《数学杂志》 1999年第4期371-376,共6页
摘 要: 本文研究了非齐次线性微分方程f(k) + Dk- 1f(k- 1) + …+ D0f = F (1)的复振荡问题.其中D0,…,Dk- 1是增长级小于1/2的亚纯函数,F0是有限级亚纯函数.当存在某个DS(0≤s≤k- 1)比其它Dj(j≠s)有较快增长的意义下起支配作用时,得到了微分方程(Ⅰ)的一定条件下亚纯解的级和零点的估计式. In this paper, we investigate the complex oscillation of the differential equationf (k) +D k-1 f (k-1) +…+D 0f=F(1)where D 0, …, D k-1 are meromorphic functions with the order of growth smaller than 1/2, F 0 is a meromorphic function with finite order of growth, and there exists a D s(0≤s≤k-1) being dominant in the sense that it has larger growth than D j(j≠s) . Under certain conditions, we obtain some estimates of the exponent of convergence of the zero sequence and the order of growth of meromorphic solution of equation (1).