A certain subclass of meromorphically q-starlike functions associated with the Janowski functions

In this paper, the authors introduce a new subclass of meromorphic q -starlike functions which are associated with the Janowski functions. A characterization of meromorphically q -starlike functions associated with the Janowski functions has been obtained when the coefficients in their Laurent series expansion about the origin are all positive. This leads to a study of coefficient estimates, distortion theorems, partial sums, and the radius of starlikeness estimates for this class. It is seen that the class considered demonstrates, in some respects, properties analogous to those possessed by the corresponding class of univalent analytic functions with negative coefficients.