Pre-Schwarzian and Schwarzian norm Estimates for Robertson class

Molla Basir Ahamed, Rajesh Hossain, Xiaoyuan Wang

Let $\mathcal{A}$ denote the class of analytic functions $f$ on the unit disk $\mathbb{D}=\{z\in \mathbb{C}:|z|<1\}$, normalized by $f(0)=0$ and $f^{\prime }(0)=1$. For $-π/2<α<Ï…