Hankel inequalities for bounded turning functions in the domain of cosine Hyperbolic function

AIMS MATHEMATICS(2023)

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摘要
In the present article, we define and investigate a new subfamily of holomorphic functions connected with the cosine hyperbolic function with bounded turning. Further some interesting results like sharp coefficients bounds, sharp Fekete-Szego estimate, sharp 2(nd) Hankel determinant and non-sharp 3(rd) order Hankel determinant. Moreover, the same estimates have been investigated for 2-fold, 3-fold symmetric functions, the first four initial sharp bounds of logarithmic coefficient and sharp second Hankel determinant of logarithmic coefficients fort his defined function family.
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关键词
holomorphic functions, Hankel determinant, Subordination, Hyperbolic function
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