On a subclass of close-to-convex functions

نویسندگان

  • Joanna Kowalczyk
  • Edyta Les-Bomba
چکیده

In this paper the authors studied the coefficient estimate of a class of functions starlike with respect to k-symmetric points defined by derivative operators D n λ introduced by Al-Shaqsi and Darus [6]. The integral representation and several coefficient inequalities of functions belonging to this class are obtained. 1 Introduction Let A denote the class of functions of the form: f (z) = z + ∞ m=2 a m z m , (1.1) which are analytic in the unit disk U = {z : |z| < 1}. Also let S denote the subclass of A consisting of all functions which are univalent in U. A function f ∈ A is said to be starlike, denoted by S * if Re zf (z) f (z) > 0.

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عنوان ژورنال:
  • Appl. Math. Lett.

دوره 23  شماره 

صفحات  -

تاریخ انتشار 2010