The Relation between Solutions of a Class of Higher Order Differential Equations with Periodic Coefficients and Functions of Small Growth

In this paper, we investigate the differential equations          1 11 0 0 0 kk zz z z kk fP e Q e f P e Q e f                   and zz kk z z z f Pe Q e f P e Q e f             R e R e      . Moreover, we obtained the relation between solutions of the two differential equations and their 1th derivatives of differential equa- tion and small functions.