Gangqiang Chen

most citedNote on the second derivative of bounded analytic functions

1 citations · 1 across the 3 of their papers we have counts for

collaborators

3 papers

math.CV2024

Variability regions for the $n$ -th derivative of bounded analytic functions

Gangqiang Chen

Let $H$ be the class of all analytic self-maps of the open unit disk $D$ . Denote by $H^{n} f (z)$ the $n$ -th order hyperbolic derivative of $f \in H$ at $z\…

math.CV2024

Variability regions for Schur class

Gangqiang Chen

Let $S$ be the class of analytic functions $f$ in the unit disk $D$ with $f (D) \subset D$ . Fix pairwise distinct points $z_1,\ldot…

math.CV2024★ 1 cited

Note on the second derivative of bounded analytic functions

Gangqiang Chen

Assume $z_{0}$ lies in the open unit disk $D$ and $g$ is an analytic self-map of $D$ . We will determine the region of values of $g^{''} (z_{0})$ in terms of $z_{0}$ , $g(z_0…

Variability regions for the n-th derivative of bounded analytic functions

Variability regions for Schur class

Note on the second derivative of bounded analytic functions

Variability regions for the $n$ -th derivative of bounded analytic functions