Author Description

Lectures held at the 6th Workshop on Operator Theory in Krein Spaces --After dinner speech on the inventor of the equality sign /A. Dijksma --Speech on the occasion of the retirement of Peter Jonas /H. Langer --Augmented Schur parameters for generalized Nevanlinna functions and approximation /D. Alpay, A. Dijksma and H. Langer --On domains of powers of linear operators and finite rank perturbations /T. Ya. Azizov... [et al.] --Finite-dimensional de Branges subspaces generated by majorants /A. Baranov and H. Woracek --Trace formulae for dissipative and coupled scattering systems /J. Behrndt, M.M. Malamud and H. Neidhardt --Approximation of N[superscript infinity symbol, subscript k]-functions I: models and regularization /A. Dijksma, A. Luger and Y. Shondin --On the block numerical range of nonnegative matrices /K.H. Förster and N. Hartanto --A quantum dot with impurity in the Lobachevsky plane /V. Geyler, P. Šťovíček and M. Tušek --One-dimensional perturbations, asymptotic expansions, and spectral gaps /S. Hassi, A. Sandovici H.S.V. de Snoo and H. Winkler --Abstract kinetic equations with positive collision operators /I.M. Karabash --On the structure of semigroups of operators acting in spaces with indefinite metric /V.A. Khatskevich and V.A. Senderov --G-self-adjoint operators in almost Pontryagin spaces /F. Philipp and C. Trunk --On a Kreĭn criterion /A. Sandovici --Two-sided weighted shifts are "almost Krein" normal /F.H. Szafraniec.