Certain subclasses of meromorphically -valent functions with positive or negative coefficients

Making use a linear operator, we introduce two novel subclasses R ( n , p , λ , α ) and C ( n , p , λ , α ) of meromorphically p -valent functions with positive and negative coefficients, respectively. The main object of this paper is to investigate the various important properties and characteristics of these subclasses of meromorphically p -valent functions. We also derive many interesting results for the Hadamard products of functions belonging to the classes R ( n , p , λ , α ) and C ( n , p , λ , α ) .