应用角域Nevanlinna理论,研究了二阶亚纯系数微分方程f''+A(z)f=0的解的零点聚值线和Borel方向之间的关系.推广了文献[5]中的一个定理.
By using the Nevanlinna's characteristic function in an angular domain,we established the connection between the cluster ray of zero-sequence and Borel direction of the solutions of second order differential equations f''+A(z)f = 0 ,where a(z) is a meromor- phic function of finite order. Results are obtained extending those by Wu Shengjian in [-5].