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Paper detail

Coupling and relaxed commutant lifting

A Redheffer type description of the set of all contractive solutions to the relaxed commutant lifting problem is given. The description involves a set of Schur class functions which is obtained by combining the method of isometric coupling with results on isometric realizations. For a number of special cases, including the case of the classical commutant lifting theorem, the description yields a proper parameterization of the set of all contractive solutions, but examples show that, in general, the Schur class function determining the contractive lifting does not have to be unique. Also some sufficient conditions are given guaranteeing that the corresponding relaxed commutant lifting problem has only one solution.

preprint2013arXivOpen access
A. E. FrazhoS. ter HorstM. A. Kaashoek
math.FA
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A. E. FrazhoS. ter HorstM. A. Kaashoek

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