Certain Subclasses of Bi-Close-to-Convex Functions Associated with Quasi-Subordination

الملخص EN

In the present investigation, we introduce certain new subclasses of the class of biunivalent functions in the open unit disc U = z : z < 1 defined by quasi-subordination.

We obtained estimates on the initial coefficients a 2 and a 3 for the functions in these subclasses.

The results present in this paper would generalize and improve those in related works of several earlier authors.