Growth of the Solutions of Higher Order Linear Differential Equations in an Angle
高阶线性微分方程解的角域增长性

The higher order linear differential equation $f^{(k)}+A_{k-1}f^{(k-1)}+\cdots+A_{1}f'+A_{0}f=0$ is considered, where $A_0, A_1, \cdots, A_{k-1}$ are analytic in an angle, and the growth and symptotic character of solutions of the equation restricted in the angle are obtained. Some existing results are improved.