Bounds of third and fourth Hankel determinants for a generalized subclass of bounded turning functions subordinated to sine function

Gagandeep Singh, Gurcharanjit Singh

Abstract


The objective of this paper is to investigate the bounds of third and fourth Hankel determinants for a generalized subclass of bounded turning functions associated with sine function, in the open unit disc. The results are also extended to two-fold and three-fold symmetric functions. This investigation will generalize the resuls of some earlier works.


Keywords


Bounded turning functions, Hankel determinant, analytic functions, coefficient inequalities

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DOI: http://dx.doi.org/10.24193/subbmath.2024.4.06

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