On <i>q</i>-Limaçon Functions

Very recently, functions that map the open unit disc <i>U</i> onto a limaçon domain, which is symmetric with respect to the real axis in the right-half plane, were initiated in the literature. The analytic characterization, geometric properties, and Hankel determinants of these families...

Full description

Bibliographic Details
Main Authors: Afis Saliu, Kanwal Jabeen, Isra Al-Shbeil, Najla Aloraini, Sarfraz Nawaz Malik
Format: Article
Language:English
Published: MDPI AG 2022-11-01
Series:Symmetry
Subjects:
Online Access:https://www.mdpi.com/2073-8994/14/11/2422
Description
Summary:Very recently, functions that map the open unit disc <i>U</i> onto a limaçon domain, which is symmetric with respect to the real axis in the right-half plane, were initiated in the literature. The analytic characterization, geometric properties, and Hankel determinants of these families of functions were also demonstrated. In this article, we present a <i>q</i>-analogue of these functions and use it to establish the classes of starlike and convex limaçon functions that are correlated with <i>q</i>-calculus. Furthermore, the coefficient bounds, as well as the third Hankel determinants, for these novel classes are established. Moreover, at some stages, the radius of the inclusion relationship for a particular case of these subclasses with the Janowski families of functions are obtained. It is worth noting that many of our results are sharp.
ISSN:2073-8994