The Schwarzian norm estimates for Janowski convex functions
Md Firoz Ali,
Sanjit Pal
Abstract:For
$-1\leq B \lt A\leq 1$
, let
$\mathcal{C}(A,B)$
denote the class of normalized Janowski convex functions defined in the unit disk
$\mathbb{D}:=\{z\in\mathbb{C}:|z| \lt 1\}$
that satisfy the subordination relation
$1+zf''(z)/f'(z)\prec (1+Az)/(1+Bz)$
. In the present article, we determine the sharp estimate of the Schwarzian norm for functions in the class
$\mathcal{C}(A,B)$
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