Sharp inequalities for q-starlike functions associated with differential subordination and q-calculus

Abstract

This paper employs differential subordination and quantum calculus to investigate a new class of $ q $-starlike functions associated with an eight-like image domain. Our study laid a foundational understanding of the behavior of these $ q $-starlike functions. We derived the results in first-order differential subordination. We established sharp inequalities for the initial Taylor coefficients and provided optimal estimates for solving the Fekete-Szegö problem and a second-order Hankel determinant applicable to all $ q $-starlike functions in this class. Furthermore, we presented a series of corollaries that demonstrate the broader implications of our findings in geometric function theory.

Keywords

• analytic functions
• univalent functions
• starlike functions
• $ q $-starlike functions
• $ q $-derivative operator
• differential subordination