Angular Derivatives and Boundary Values of H(b) Spaces of Unit Ball of ${\mathbb{C}}^n$

Abstract

In this work we study deBranges-Rovnyak spaces, $H(b)$, on the unit ball of ${\mathbb{C}}^n$. We give an integral representation of the functions in $H(b)$ through the Clark measure on $S^n$ associated with $b$. A characterization of admissible boundary limits is given in relation with finite angular derivatives. Lastly, we examine the interplay between Clark measures and angular derivatives showing that Clark measure associated with $b$ has an atom at a boundary point if and only if $b$ has finite angular derivative at the same point.

10 pages, comments are welcome