The Kreĭn-Langer problem for Hilbert space operator valued functions on the band

DOI10.1007/BF01272882zbMath0937.47040OpenAlexW1990460034MaRDI QIDQ1304742

Stefania A. M. Marcantognini, Ramón Bruzual

Publication date: 13 June 2000

Published in: Integral Equations and Operator Theory (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1007/bf01272882

zbMATH Keywords

existenceuniquenessparametrizationextensionHermitian matrixKreĭn-Langer problemlocal semigroup of isometries

Mathematics Subject Classification ID

Groups and semigroups of linear operators (47D03) Functions whose values are linear operators (operator- and matrix-valued functions, etc., including analytic and meromorphic ones) (47A56) Linear operator methods in interpolation, moment and extension problems (47A57) Linear operators on spaces with an indefinite metric (47B50)

Related Items (1)

On extensions of indefinite functions defined on a rectangle

Cites Work

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• Local semigroups of isometries in \(\Pi_ \kappa\)-spaces and related continuation problems for \(\kappa\)-indefinite Toeplitz kernels
• On extensions of positive definite operator-valued functions
• Commuting unitary Hilbert space extensions of a pair of Kreĭn space isometries and the Kreĭn-Langer problem in the band
• Über indexerhaltende Erweiterungen eines hermiteschen Operators im Pontrjaginraum

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