Close-to-convex functions defined by fractional operator

Let S denote the class of functions f(z )= z + a2z 2 + ... analytic and univalent in the open unit disc D = {z ∈ C||z| 0 in , and prove that every close-to-convex function is univalent. The normalized class of close-to-convex functions denoted by K. These classes are related by the proper inclusions C ⊂ S ∗ ⊂ K ⊂ S. In this paper, we generalize the close-to-convex functions and denote K(λ) the class of such functions. Various properties of this class of functions is alos studied.