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  • P-ISSN1226-0657
  • E-ISSN2287-6081
  • KCI

ISSN : 1226-0657

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Vol.31 No.2

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Coefficient Inequalities for a Unified Class of Bounded Turning Functions associated with Cosine Hyperbolic Function

Journal of the Korean Society of Mathematical Education Series B: The Pure and Applied Mathematics / Journal of the Korean Society of Mathematical Education Series B: The Pure and Applied Mathematics, (P)1226-0657; (E)2287-6081
2024, v.31 no.2, pp.201-216
https://doi.org/10.7468/jksmeb.2024.31.2.201
Gagandeep Singh (Khalsa College)
Gurcharanjit Singh (G.N.D.U. College)
Navyodh Singh (Khalsa College)
Navjeet Singh (Khalsa College)
Gagandeep, S. , Gurcharanjit, S. , Navyodh, S. , & Navjeet, S. (2024). Coefficient Inequalities for a Unified Class of Bounded Turning Functions associated with Cosine Hyperbolic Function. Journal of the Korean Society of Mathematical Education Series B: The Pure and Applied Mathematics, 31(2), 201-216, https://doi.org/10.7468/jksmeb.2024.31.2.201

Abstract

The aim of this paper is to study a new and unified class R {{alpha}} atop {{Cosh}} of analytic functions associated with cosine hyperbolic function in the open unit disc E = {z ∈ ℂ : |z| < 1}. Some interesting properties of this class such as initial coefficient bounds, Fekete-Szegö inequality, second Hankel determinant, Zalcman inequality and third Hankel determinant have been established. Furthermore, these results have also been studied for two-fold and three-fold symmetric functions.

keywords
analytic functions, subordination, coefficient bounds, Fekete-Szegö inequality, Zalcman inequality, cosine hyperbolic function, Hankel determinant.

Journal of the Korean Society of Mathematical Education Series B: The Pure and Applied Mathematics

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