Turkish Journal of Mathematics
Abstract
In this paper, we introduce two new subclasses of biunivalent functions analytic in the exterior of the unit disc. The bounds obtained for the $zero^{th}$, first and second coefficient improves upon earlier known results. The results are obtained by refining the well-known estimates for the initial coefficients of the Carth$\acute{e}$odory functions.
DOI
10.3906/mat-1908-66
Keywords
Analytic function, analytic continuation, univalent functions, biunivalent functions, coefficient bounds
First Page
98
Last Page
107
Recommended Citation
BARIK, S (2020). Coefficient estimation of a certain subclass of bi-close-to-convex functions analytic in the exterior of the unit disc. Turkish Journal of Mathematics 44 (1): 98-107. https://doi.org/10.3906/mat-1908-66
