Characterizations of some domains via Carath\'eodory extremals
Abstract
In this paper we characterize the unit disc, the bidisc and the symmetrized bidisc \[ G =\(z+w,zw):|z|<1,\ |w|<1\ \] in terms of the possession of small classes of analytic maps into the unit disc that suffice to solve all Carath\'eodory extremal problems in the domain.
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