On quasi-subordination for bi-univalency involving generalized distribution series associated with remodelled s-sigmoid function

In this paper, the authors investigate the bi-univalency of the generalized distribution series associated with quasi-subordination and remodelled s-sigmoid function. The early few coefficients are obtained to achieve our goal. The results obtained are new to the history of bi-univalency.

Keywords:

Analytic function , univalent function , starlike function , convex function , quasi-subordination , logistic sigmoid function , s−sigmoid function