Comprehensive Analysis of the Fourth Hankel Determinant Associated with the Class of Janowski Starlike Functions with Complex Parameters

Abstract

We consider the class of normalized holomorphic functions f in

such a way that the ratio ((fr(z))/(q(z)) is subordinate to function

1+Az (Janowski function), and q(z) is subordinate to 2

−z (sigmoid

1+Bz 1+e

function), and we derive a fourth Hankel determinant bound for this.