On the zeros of second order linear differential polynomials

J. K. Langley
1990 Proceedings of the Edinburgh Mathematical Society  
We determine all functions /(z) meromorphic in the plane such that /'(z)//(z) has finite order and /(z) and F(z) have only finitely many zeros, where F(z) = f"(z) + Af(z) for some constant A.
doi:10.1017/s0013091500018186 fatcat:yay6ox6byfhifcvtjwxibxzs6i