Contributions to operator theory in spaces with an indefinite metric. The Heinz Langer anniversary volume on the occasion of his 60th birthday (Q1271434)

The articles of this volume will be reviewed individually. Indexed articles: \textit{Dijksma, Aad; Gohberg, Israel}, Langer and his work, 1-22 [Zbl 0910.01004] \textit{Adamyan, V.; Pivovarchik, V.}, On the spectra of some classes of quadratic operator pencils, 23-36 [Zbl 0920.47012] \textit{Alpay, D.; Peretz, Y.}, Special realizations for Schur upper triangular operators, 37-90 [Zbl 0920.46018] \textit{Azizov, Tomas Ya.; Khatskevich, Vladimir L.; Disksma, Aad}, On the defect of noncontractive operators in Kreĭn spaces: A new formula and some applications, 91-112 [Zbl 0931.47027] \textit{Ćurgus, Branko; Najman, Branko}, Positive differential operators in the Krein space \(L^2(\mathbb{R}^n)\), 113-129 [Zbl 0921.47032] \textit{Ellis, Robert L.; Gohberg, Israel; Lay, David C.}, Singular values of positive pencils and applications, 131-146 [Zbl 0909.15002] \textit{Fleige, Andreas; Najman, Branko}, Perturbations of Krein spaces preserving the nonsingularity of the critical point infinity, 147-155 [Zbl 0921.47033] \textit{Fritzsche, Bernd; Kirstein, Bernd; Müller, Karsten}, An analysis of the block structure of \(j_{qq}\)-inner functions, 157-185 [Zbl 0918.30021] \textit{Hassi, Seppo; Kaltenbäck, Michael; de Snoo, Henk}, Selfadjoint extension of the orthogonal sum of symmetric relations. II, 187-200 [Zbl 0935.47006] \textit{Hassi, Seppo; de Snoo, Henk; Woracek, Harald}, Some interpolation problems of Nevanlinna-Pick type. The Kreĭn-Langer method, 201-216 [Zbl 0912.30023] \textit{Hinton, Don; Schneider, Albert}, On the spectral representation for singular selfadjoint boundary eigenvalue problems, 217-251 [Zbl 0911.34018] \textit{Iokhvidov, E. I.}, Some characteristics of a linear manifold in a Kreĭn space and their applications, 253-257 [Zbl 0931.47028] \textit{Jonas, Peter}, Riggings and relatively form bounded perturbations of nonnegative operators in Kreĭn spaces, 259-273 [Zbl 0919.47025] \textit{Kaashoek, M. A.; Ran, A. C. M.}, Norm bounds for Volterra integral operators and time-varying linear systems with finite horizon, 275-290 [Zbl 0915.47011] \textit{Lancaster, Peter; Maroulas, John; Zizler, Peter}, The numerical range of selfadjoint matrix polynomials, 291-304 [Zbl 0909.15008] \textit{Markus, A.; Maroulas, J.; Psarrakos, P.}, Spectral properties of a matrix polynomial connected with a component of its numerical range, 305-308 [Zbl 0920.47013] \textit{Naboko, S. N.; Tretter, C.}, Lyapunov stability of a perturbed multiplication operator, 309-326 [Zbl 0921.47028] \textit{Najman, B.; Veselić, K.}, Multiplicative perturbations of positive operators in Krein spaces, 327-336 [Zbl 1128.47313] \textit{Sasvári, Zoltán}, On the number of negative squares of certain functions, 337-353 [Zbl 0926.46021] \textit{Shkalikov, A. A.}, Factorization of elliptic pencils and the Mandelstam hypothesis, 355-387 [Zbl 0919.47013] \textit{Szafraniec, Franciszek Hugon}, An inductive limit procedure within the quantum harmonic oscillator, 389-395 [Zbl 0931.47026] \textit{Winkler, Henrik}, Canonical systems with a semibounded spectrum, 397-417 [Zbl 0917.34015]