Schur functions, operator colligations and reproducing kernel Pontryagin spaces. Operator theory; Bd. 96.

Alpay, Daniel; Dijksma, Aad; Rovnyak, James; Snoo, Hendrik De

ISBN 10: 3764357630 / ISBN 13: 9783764357634

Published by Basel, Birkhäuser, 1997

About this Item

Ex-library with stamp and library-signature. GOOD condition, some traces of use. C-04063 9783764357634 Sprache: Englisch Gewicht in Gramm: 1050. Seller Inventory # 2489999

Bibliographic Details

Title: Schur functions, operator colligations and ...

Publisher: Basel, Birkhäuser

Publication Date: 1997

Binding: Hardcover

About this title

Synopsis:

Generalized Schur functions are scalar- or operator-valued holomorphic functions such that certain associated kernels have a finite number of negative squares. This book develops the realization theory of such functions as characteristic functions of coisometric, isometric, and unitary colligations whose state spaces are reproducing kernel Pontryagin spaces. This provides a modern system theory setting for the relationship between invariant subspaces and factorization, operator models, Krein-Langer factorizations, and other topics. The book is intended for students and researchers in mathematics and engineering. An introductory chapter supplies background material, including reproducing kernel Pontryagin spaces, complementary spaces in the sense of de Branges, and a key result on defining operators as closures of linear relations. The presentation is self-contained and streamlined so that the indefinite case is handled completely parallel to the definite case.