Investigation of the Hankel Determinant Sharp Bounds for a Specific Analytic Function Linked to a Cardioid-Shaped Domain

Abstract

One of the challenging tasks in the study of function theory is how to obtain sharp estimates of coefficients that appear in the Taylor–Maclaurin series of analytic univalent functions, and for obtaining these bounds, researchers used the concepts of Carathéodory functions. Among these coefficient-related problems, the problem of the third-order Hankel determinant sharp bound is the most difficult one. The aim of the present study is to determine the sharp bound of the Hankel determinant of third order by using the methodology of the aforementioned Carathéodory function family. Further, we also study some other coefficient-related problems, such as the Fekete–Szegő inequality and the second-order Hankel determinant. We examine these results for the family of bounded turning functions linked with a cardioid-shaped domain.

Some Coefficient of Inequility for Subclass Of holomorphic Functions

“…The complexity of the challenge significantly increases when addressing the scenario where r = 3 as opposed to r = 2. Babalola [7] was the pioneer in attempting to establish an upper bound for |H 3,1 (f)| across the domains of ℜ, S * , and K. In recent times, multiple researchers have actively pursued the task of determining a upper bound for |H 3,1 (f)| (see [2,3,4,5,6,8,20,21,22,23,24,25])…”