Title | Contributions to Operator Theory in Spaces with an Indefinite Metric [electronic resource] : The Heinz Langer Anniversary Volume / edited by Aalt Dijksma, Israel Gohberg, Marinus A. Kaashoek, Reinhard Mennicken |
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Imprint | Basel : Birkhรคuser Basel : Imprint: Birkhรคuser, 1998 |
Connect to | http://dx.doi.org/10.1007/978-3-0348-8812-7 |
Descript | VII, 421 p. online resource |
Heinz Langer and his work -- On the spectra of some class of quadratic operator pencils -- Special realizations for Schur upper triangular operators -- On the defect of noncontractive operators in Kre?nin spaces: a new formula and some applications -- Positive differential operators in the Krein space L2(M?n) -- Singular values of positive pencils and applications -- Perturbations of Krein spaces preserving the nonsingularity of the critical point infinity -- An analysis of the block structure of jqq-inner functions -- Selfadjoint extensions of the orthogonal sum of symmetric relations, II -- Some interpolation problems of Nevanlinna-Pick type. The Krein-Langer method -- On the spectral representation for singular selfadjoint boundary eigenvalue problems -- Some characteristics of a linear manifold in a Kre?nn space and their applications -- Riggings and relatively form bounded perturbations of nonnegative operators in Krem spaces -- Norm bounds for Volterra integral operators and time-varying linear systems with finite horizon -- The numerical range of selfadjoint matrix polynomials -- Spectral properties of a matrix polynomial connected with a component of its numerical range -- Lyapunov stability of a multiplication operator perturbed by a Volterra operator -- Multiplicative perturbations of positive operators in Krein spaces -- On the number of negative squares of certain functions -- Factorization of elliptic pencils and the Mandelstam hypothesis -- An inductive limit procedure within the quantum harmonic oscillator -- Canonical systems with a semibounded spectrum