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中文摘要：
应用角域Nevanlinna理论和Ahlfors覆盖曲面理论，研究了二阶微分方程f″＋A（z）f=0的解的零点分布．证明了在复平面上至少存在一条半直线，使得二阶微分方程解在该直线上的零点的径向收敛指数为无穷．用新的方法证明了伍胜健在文献[5]中的一个定理．
英文摘要：
In this paper, we investigate the distribution of zeros of solutions of second order differential equations f″ ＋ A（z）f = 0, where A（z） is an entire function of finite order. By using the Nevanlinna＇s characteristic function and Ahlfors-Shimizu＇s characteristic function on an angular domain, we established the existence of some ray which has the property that near which the exponent of convergence of the zero-sequence is infinite. Furthermore, by using a new method, we give a different proof of the Theorem 2 which has been given by Wu Shengjian in [5].
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