ESTIMATES OF INITIAL COEFFICIENTS FOR FUNCTIONS IN NEW SUBCLASSES OF BI-UNIVALENT FUNCTIONS DEFINED USING GENERALIZED DIFFERENTIAL OPERATOR

We dened a new subclass of the function class $\sigma$ in the unit disk associated with a generalized differential operator. We estimated some coefficient bounds for the functions in the dened new subclass. As special cases, well-known results were obtained by varying parameters in the main results.