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Home  >  Volume 31 (July 2015)

Coefficient Estimates for New Subclasses of Ma-Minda Bi-starlike Functions by O. A. Fadipe-Joseph, Y.O. Afolabi and B. O. Moses pp 1 – 8
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Abstract

In this paper, we make use of the principle of subordination to define new subclasses of bi-univalent functions, the bounds of the coefficients of functions in these classes are obtained. Furthermore, Fekete-Szego functionals for the new classes involving sigmoid function are given.

Keywords: Bi-starlike function, Subordination, Sigmoid function, Fekete-Szego functional.

AMS Mathematics Subject Classification (2010): 30C45.

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