Toeplitz determinants for starlike mappings of order α in several complex variables

Abstract

Let $F(z)=zf(z)$, where $f$ is a normalized scalar holomorphic function on the unit ball $\mathbb B$ of a complex Banach space $X$ or on the unit polydisk $\mathbb U^n$ of $\mathbb{C}^n$. We establish sharp bounds for two Toeplitz determinants involving the second, third and fourth Fréchet derivatives of $F$ when $F$ is starlike of order $α$, $0\leqα<1$. The first bound is sharp for the full range $0\leqα<1$, while the second is sharp for $0\leqα\leq 2/3$. The extremal mappings are explicitly identified, confirming the sharpness of the estimates.