Turkish Journal of Mathematics
Second Hankel determinant for a subclass of analytic bi-univalent functions defined by subordination
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.
DOI
10.3906/mat-1710-106
Keywords
Bi-univalent functions, Fekete-Szego determinant, second Hankel determinant, differential subordination, Carathéodory functions
First Page
2798
Last Page
2808
Recommended Citation
MOTAMEDNEZHAD, A, BULBOACA, T, ADEGANI, E. A, & DIBAGAR, N (2018). Second Hankel determinant for a subclass of analytic bi-univalent functions defined by subordination. Turkish Journal of Mathematics 42 (5): 2798-2808. https://doi.org/10.3906/mat-1710-106
