ON A NEW SUBCLASS OF HARMONIC MEROMORPHIC FUNCTIONS WITH FIXED RESIDUE ?

We use the differential operator D-lambda,delta,phi(n,mu) to introduce a new class SH lambda,delta,phi,mu (n,gamma,beta,xi)(w, k, alpha) of meromorphic harmonic functions with fixed residue xi in U-omega. Then we give the coefficient estimates, distortion theorem and extreme points of classes SH lambda,delta,phi,mu (n,gamma,beta,xi)(w, k, alpha) and SH lambda,delta,phi,mu (n,gamma,beta,xi)[w, k, alpha].