New class of symmetric starlike functions subordinate to the generating function of Gregory coefficients

Function theory research has long struggled with the challenge of deriving sharp estimates for the coefficients of analytic and univalent functions. Researchers have advanced the field by developing and applying a variety of approaches to get these bounds. In the current paper, we apply the technique of subordination, we define the family of symmetric starlike functions which is related to generating function of Gregory coefficients. We provide sharp bounds for the problem concerning the coefficients of the family of symmetric starlike functions connected to the generating function of Gregory coefficients by utilizing the notion of functions with positive real component. These problems include first five sharp coefficient bounds and Fekete-Szego problem along with the Hankel determinant of order three. Additionally, we explore the optimal bounds (sharp bounds) for two important functions, the logarithmic function and the inverse function within the same class of symmetric starlike functions which is related to generating function of Gregory coefficients.

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Publication Details

Journal
PLoS ONE
Published
2025-05-05
DOI
https://doi.org/10.1371/journal.pone.0317339
Primary Topic
Analytic and geometric function theory
Type
article
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article

New class of symmetric starlike functions subordinate to the generating function of Gregory coefficients

Muqrin A. Almuqrin, Naeem Ahmad, Mohammad Faisal Khan, Mohammed AbaOud
PLoS ONE
Analytic and geometric function theory
article

New class of symmetric starlike functions subordinate to the generating function of Gregory coefficients

Muqrin A. Almuqrin, Naeem Ahmad, Mohammad Faisal Khan, Mohammed AbaOud
article en

Abstract

Function theory research has long struggled with the challenge of deriving sharp estimates for the coefficients of analytic and univalent functions. Researchers have advanced the field by developing and applying a variety of approaches to get these bounds. In the current paper, we apply the technique of subordination, we define the family of symmetric starlike functions which is related to generating function of Gregory coefficients. We provide sharp bounds for the problem concerning the coefficients of the family of symmetric starlike functions connected to the generating function of Gregory coefficients by utilizing the notion of functions with positive real component. These problems include first five sharp coefficient bounds and Fekete-Szego problem along with the Hankel determinant of order three. Additionally, we explore the optimal bounds (sharp bounds) for two important functions, the logarithmic function and the inverse function within the same class of symmetric starlike functions which is related to generating function of Gregory coefficients.

PLoS ONEVol. 20(5)
Saudi Electronic University (SA), Qassim University (SA), Majmaah University (SA), Imam Mohammad ibn Saud Islamic University (SA)
Openalex Percentile: Top 86%
Analytic and geometric function theory
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New class of symmetric starlike functions subordinate to the generating function of Gregory coefficients — Muqrin A. Almuqrin, Naeem Ahmad, et al. · PLoS ONE (2025) | TGRS Research Map | TGRS