Bulletin of the
Korean Mathematical Society BKMS

We give sufficient coefficient conditions for a class of meromorphic univalent harmonic functions that are starlike of some order. Furthermore, it is shown that these conditions are also necessary when the coefficients of the analytic part of the function are positive and the coefficients of the co-analytic part of the function are negative. Extreme points, convolution and convex combination conditions for these classes are also determined. Finally, comparable results are given for the convex analogue.

Keywords: harmonic, meromorphic, starlike, convex functions

MSC numbers: 30C45, 30C50