8 citations · 44 across the 30 of their papers we have counts for
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Description of Helson-Szegö measures in terms of the Schur parameter sequences of associated Schur functions
Vladimir K. Dubovoy, Bernd Fritzsche, Bernd Kirstein
Let mu be a probability measure on the Borelian sigma-algebra of the unit circle. Then we associate a Schur function theta in the unit disk with mu and give characterizations of th…
On an Interpolation Problem for J-Potapov Functions
Bernd Fritzsche, Bernd Kirstein, Uwe Raabe
Let, J, be an m-by-m-signature matrix and let D be the open unit disk in the complex plane. Denote by P{J,0}(D) the class of all meromorphic m-by-m-matrix-valued functions, f, in D…
Shift Operators Contained in Contractions, Pseudocontinuable Schur Functions and Orthogonal Systems on the Unit Circle
Vladimir K. Dubovoy, Bernd Fritzsche, Bernd Kirstein
The main aim of this paper is to establish the connection between well-known criteria for the pseudocontinuability of a non-inner Schur function Theta in the unit disk. In a canoni…