Alpay D., Kirstein B. (Eds.) Indefinite Inner Product Spaces, Schur Analysis, and Differential Equations: A Volume Dedicated to Heinz Langer

Springer International Publishing AG, part of Springer Nature, 2018. — 501 p. — (Operator Theory: Advances and Applications 263) — ISBN: 3319688480.This is a volume dedicated to Heinz Langer. It includes biographical material and carefully selected papers.
Heinz Langer has made fundamental contributions to operator theory. In particular, he studied the domains of operator pencils and nonlinear eigenvalue problems, the theory of indefinite inner product spaces, operator theory in Pontryagin and Krein spaces, and applications to mathematical physics. His works include studies on and applications of Schur analysis in the indefinite setting, where the factorization theorems of Krein and Langer for generalized Schur functions and of Dijksma-Langer-Luger-Shondin play a key role.
The contributions in this volume reflect Heinz Langer's research interests and will be appealing to a broad research audience in operator theory.Editorial Introduction
Biographical Material
List of Publications of Professor Dr. Dr. h.c. mult. Heinz Langer
Some Pictures from the Ceremony
Heinz Langer – Pioneer of Operator Theory in Indefinite Inner Product Spaces
Papers
The Inverse Monodromy Problem
The Bitangential Matrix Nevanlinna–Pick Interpolation Problem Revisited
Finite Rank Perturbations in Pontryagin Spaces and a Sturm–Liouville Problem with λ-rational Boundary Conditions
On Unimodular Transformations of Conservative L-systems
Spectral Theory of Stationary Random Fields and their Generalizations. A Short Historical Survey
Semicircular-like, and Semicircular Laws Induced by Certain C∗-probability Spaces over the Finite Adele Ring AQ
On the Asymptotic Behaviour of the Zeros of the Solutions of a Functional-differential Equation with Rescaling
Rational q × q Carath´eodory Functions and Central Non-negative Hermitian Measures
On the Spectrum of an Operator in Truncated Fock Space
Limit Properties of Eigenvalues in Spectral Gaps
Self-adjoint Boundary Conditions for the Prolate Spheroid Differential Operator
An Addendum to a Paper by Li and Zhang
On Accelerants and Their Analogs, and on the Characterization of the Rectangular Weyl Functions for Dirac Systems with Locally Square-Integrable Potentials on a Semi-Axis
Dirac Equation: the Stationary and Dynamical Scattering Problems
Compressed Resolvents, Q-functions and h0-resolvents in Almost Pontryagin Spaces
Dissymmetrising Inner Product Spaces