Titlebook: Contributions to Operator Theory in Spaces with an Indefinite Metric; The Heinz Langer Ann Aalt Dijksma,Israel Gohberg,Reinhard Mennicken B

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Visualisierung meteorologischer Datenat similar realizations exist in the “nonstationary setting”, i.e. when one considers upper triangular contractions (which appear in time-variant system theory as “transfer functions” of dissipative systems). Two approaches are used: complementation theory and an approach based on the theory of relations in Hilbert spaces.

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Special realizations for Schur upper triangular operators,at similar realizations exist in the “nonstationary setting”, i.e. when one considers upper triangular contractions (which appear in time-variant system theory as “transfer functions” of dissipative systems). Two approaches are used: complementation theory and an approach based on the theory of relations in Hilbert spaces.

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Multiplicative perturbations of positive operators in Krein spaces,tical points, see [9]; if neither of these points is a singular critical point then . is similar to a Hilbert space selfadjoint operator, that is, it is a scalar operator with real spectrum (see [9] for the definition and properties of the Krein space operators).

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G. Schild,M. Corbel,P. Corran,P. MinorThis volume is dedicated to Professor Heinz Langer to honor him for his outstanding contributions to mathematics. His results in spectral analysis and its applications, in particular in spaces with an indefinite metric, are fundamental. Five main themes emerge in Heinz Langer’s work, some of them are closely connected or have much in common: