CYCLICITY OF THE SHIFT OPERATOR AND A RELATED COMPLETENESS PROBLEM IN DE BRANGES-ROVNYAK SPACES
Abstract
In this paper, we study the cyclic vectors of the shift operator $S_b$ acting on de Branges--Rovnyak space $\mathcal H(b)$ associated to a non-extreme point of the closed unit ball of $H^\infty$. We highlight an interesting link with a completeness problem that we study using the Cauchy transform. This enables us to obtain some nice consequences on cyclicity.
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