On Certain New Subclass of Sakaguchi Type Function Related to Sigmoid Functions
Abstract
The object of the present paper is to obtain initial coefficients | |,| |,| |, upper bounds of | | and second Hankel determinant associated with a class of analytic univalent function of sakaguchi type function related to sigmoid function in the open unit disc ∆. Various authors as Abiodum, Tinuoye Oladipo, Murugusundaramoorthy et. al., and Olatunji have studied sigmoid function for different classes of analytic and univalent functions. Our results serves as a generalisation in this direction and it gives birth some existing subclasses of functions.
About this article
Keywords
- coefficient estimate
- Analytic function
- univalent function
- Starlike function
- convex functionsubordination
- upper bound
- sigmoid function
- differential operator
- second Hankel determinant.
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