A sharpened Schwarz-Pick operatorial inequality for nilpotent operators

Details A sharpened Schwarz-Pick operatorial inequality for nilpotent operators A sharpened Schwarz-Pick operatorial inequality for nilpotent operators

2012-02-17

arxiv.org/abs/1202.3962v1

Mathematics

Functional Analysis

Scientific paper

Let denote by $S(\phi)$ the extremal operator defined by the compression of the unilateral shift $S$ to the model subspace $ H(\phi)=H^{2} \ominus \phi H^{2} $ as the following $S(\phi)f(z)=P(zf(z)),$ where $P$ denotes the orthogonal projection from the Hardy space $H^{2}$ onto $ H(\phi)$ and $\phi$ is an inner function on the unit disc. In this mathematical notes, we give an explicit formula of the numerical radius of the truncated shift $S(\phi)$ in the particular case where $\phi$ is a finite Blaschke product with unique zero and an estimate on the general case. We establish also a sharpened Schwarz-Pick operatorial inequality generalizing a U. Haagerup and P. de la Harpe result for nilpotent operators

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