Bohr-Rogosinski type inequalities for concave univalent functions

Abstract

In this paper, we generalize and investigate Bohr-Rogosinski's inequalities and the Bohr-Rogosinski phenomenon for the subfamilies of univalent (i.e., one-to-one) functions defined on unit disk $\mathbb{D}:=\{z\in \mathbb{C}:|z|<1\}$ which maps to the concave domain, i.e., the domain whose complement is a convex set. All the results are proved to be sharp.