Gang Chen

collaborators

3 papers

math.CV2021

Variability regions for the fourth derivative of bounded analytic functions

Gangqiang Chen

Let $z_{0}$ and $w_{0}$ be given points in the open unit disk $D$ with $∣ w_{0} ∣ < ∣ z_{0} ∣$ , and $H_{0}$ be the class of all analytic self-maps $f$ of $D$ normaliz…

math.CV2020

Variability regions for the third derivative of bounded analytic functions

Gangqiang Chen

Let $z_{0}$ and $w_{0}$ be given points in the open unit disk $D$ with $∣ w_{0} ∣ < ∣ z_{0} ∣$ , and $H_{0}$ be the class of all analytic self-maps $f$ of $D$ normaliz…

math.CV2020

Variability regions for the second derivative of bounded analytic functions

Gangqiang Chen, Hiroshi Yanagihara

Let $z_{0}$ and $w_{0}$ be given points in the open unit disk $D$ with $∣ w_{0} ∣ < ∣ z_{0} ∣$ . Let $H_{0}$ be the class of all analytic self-maps $f$ of $D$ normaliz…