Schur functions and their realizations in the slice hyperholomorphic setting

Details Schur functions and their realizations in the slice hyperholomorphic setting Schur functions and their realizations in the slice hyperholomorphic setting

2011-10-12

arxiv.org/abs/1110.2634v1

Mathematics

Functional Analysis

Scientific paper

we start the study of Schur analysis in the quaternionic setting using the theory of slice hyperholomorphic functions. The novelty of our approach is that slice hyperholomorphic functions allows to write realizations in terms of a suitable resolvent, the so called S-resolvent operator and to extend several results that hold in the complex case to the quaternionic case. We discuss reproducing kernels, positive definite functions in this setting and we show how they can be obtained in our setting using the extension operator and the slice regular product. We define Schur multipliers, and find their co-isometric realization in terms of the associated de Branges-Rovnyak space.

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