Spectral Nevanlinna-Pick problem and weak extremals in the symmetrized bidisc

preprint2014arXivOpen access

Abstract

The main goal of the paper is to study mm-extremal mappings in the symmetrized bidisc showing that they are rational and $\GG_2$-inner which, in particular, answers a question posed in \cite{Agl-Lyk-You 2013}.

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