H. Yanagihara

activity

20152022

most citedOn a class of univalent functions defined by a differential inequality

2 citations · 3 across the 7 of their papers we have counts for

collaborators

Showing 2020Show all

3 papers · 1 filter

math.CV2020★ 2 cited

On a class of univalent functions defined by a differential inequality

Md Firoz Ali, Vasudevarao Allu, Hiroshi Yanagihara

For $0 < λ \leq 1$ , let $U (λ)$ be the class analytic functions $f (z) = z + \sum_{n = 2}^{\infty} a_{n} z^{n}$ in the unit disk $D$ satisfying $∣ f^{'} (z) (z / f (z))^{2} - 1∣ < λ$ and $\mat…

math.CV2020★ 1 cited

An application of Schur algorithm to variability regions of certain analytic functions-II

Md Firoz Ali, Vasudevarao Allu, Hiroshi Yanagihara

We continue our study on variability regions in \cite{Ali-Vasudevarao-Yanagihara-2018}, where the authors determined the region of variability $V_Ω^j (z_0, c ) = \{ \int_0^{z_0} z^…

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…