The Bohr radius for operator valued functions on simply connected domain
Ahammed, Sabir, Molla Basir Ahamed · arXiv (Cornell University) · 2024
In this paper, we first establish an improved Bohr inequality for the class of operator-valued holomorphic functions $f$ on a simply connected domain $Ω$ in $\mathbb{C}$. Next, we establish a generalization of refined version of the Bohr inequality and the Bohr-Rogosinski inequality with the help of the sequence $φ=\{φ_n(r) \}^{\infty}_{n=0}$ of non-negative continuous functions in $[0,1)$ such that the series $\sum_{n=0}^{\infty}φ_n(r)$ converges locally uniformly on the interval $[0,1)$. All the results are proved to be sharp. Moreover, We establish the Bohr inequality and the Bohr-Rogosinski inequality for the class of operator-valued $ν$-Bloch functions defined in two different simply connected domains, $Ω$ and $Ω_γ$, in $\mathbb{C}$.