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Start Over Author "Nesa Dibagar" Journal turkish journal of mathematics
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1. Second Hankel determinant for a subclass of analytic bi-univalent functions defined by subordination

Author

Nesa Dibagar, Ebrahim Analouei Adegani, Ahmad Motamednezhad, and Teodor Bulboacă

Subjects
Subordination (linguistics), Pure mathematics, General Mathematics, 010102 general mathematics, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, 02 engineering and technology, 0101 mathematics, 01 natural sciences, Bi-univalent functions,Fekete-Szego determinant,second Hankel determinant,differential subordination,Carathéodory functions, Subclass, Mathematics
Abstract

In this work with a different technique we obtain upper bounds of the functional $\left|a_2a_4-a_3^2\right|$ for functions belonging to a comprehensive subclass of analytic bi-univalent functions, which is defined by subordinations in the open unit disk. Moreover, our results extend and improve some of the previously known ones.

Published
2018
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