Heinz Langer


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Person Info

NAME

Heinz

SURNAME

Langer

Publications in SciGraph latest 50 shown

  • 2019-02 Compressed Resolvents and Reduction of Spectral Problems on Star Graphs in COMPLEX ANALYSIS AND OPERATOR THEORY
  • 2018-08 Compressions of Self-Adjoint Extensions of a Symmetric Operator and M.G. Krein’s Resolvent Formula in INTEGRAL EQUATIONS AND OPERATOR THEORY
  • 2017-09-27 Finite-dimensional Self-adjoint Extensions of a Symmetric Operator with Finite Defect and their Compressions in ADVANCES IN COMPLEX ANALYSIS AND OPERATOR THEORY
  • 2016-09 Dirac–Krein Systems on Star Graphs in INTEGRAL EQUATIONS AND OPERATOR THEORY
  • 2016-05 Transfer Functions and Local Spectral Uniqueness for Sturm-Liouville Operators, Canonical Systems and Strings in INTEGRAL EQUATIONS AND OPERATOR THEORY
  • 2014-01 Continuation of Hermitian Positive Definite Functions and Related Questions in INTEGRAL EQUATIONS AND OPERATOR THEORY
  • 2013-02 Bessel-Type Operators with an Inner Singularity in INTEGRAL EQUATIONS AND OPERATOR THEORY
  • 2012 Linearization, Factorization, and the Spectral Compression of a Self-adjoint Analytic Operator Function Under the Condition (VM) in A PANORAMA OF MODERN OPERATOR THEORY AND RELATED TOPICS
  • 2010-05 Sturm-Liouville Operators with Singularities and Generalized Nevanlinna Functions in COMPLEX ANALYSIS AND OPERATOR THEORY
  • 2009-04 Self-adjoint Analytic Operator Functions: Local Spectral Function and Inner Linearization in INTEGRAL EQUATIONS AND OPERATOR THEORY
  • 2009 The Schur Transformation for Nevanlinna Functions: Operator Representations, Resolvent Matrices, and Orthogonal Polynomials in MODERN ANALYSIS AND APPLICATIONS
  • 2008-03 The Virozub–Matsaev Condition and Spectrum of Definite Type for Self-adjoint Operator Functions in COMPLEX ANALYSIS AND OPERATOR THEORY
  • 2008 Augmented Schur Parameters for Generalized Nevanlinna Functions and Approximation in SPECTRAL THEORY IN INNER PRODUCT SPACES AND APPLICATIONS
  • 2007-05 The Schur Transformation for Generalized Nevanlinna Functions: Interpolation and Self-Adjoint Operator Realizations in COMPLEX ANALYSIS AND OPERATOR THEORY
  • 2007 On the Spectrum of the Self-adjoint Extensions of a Nonnegative Linear Relation of Defect One in a Krein Space in OPERATOR THEORY IN INNER PRODUCT SPACES
  • 2007 The Transformation of Issai Schur and Related Topics in an Indefinite Setting in SYSTEM THEORY, THE SCHUR ALGORITHM AND MULTIDIMENSIONAL ANALYSIS
  • 2006-10 Spectral Theory of the Klein–Gordon Equation in Pontryagin Spaces in COMMUNICATIONS IN MATHEMATICAL PHYSICS
  • 2006 Basic Boundary Interpolation for Generalized Schur Functions and Factorization of Rational J-unitary Matrix Functions in INTERPOLATION, SCHUR FUNCTIONS AND MOMENT PROBLEMS
  • 2006 Partial Non-stationary Perturbation Determinants for a Class of J-symmetric Operators in OPERATOR THEORY IN KREIN SPACES AND NONLINEAR EIGENVALUE PROBLEMS
  • 2006 Bounded Normal Operators in Pontryagin Spaces in OPERATOR THEORY IN KREIN SPACES AND NONLINEAR EIGENVALUE PROBLEMS
  • 2004-10 A Krein Space Approach to PT-symmetry in CZECHOSLOVAK JOURNAL OF PHYSICS
  • 2004 Partial Non-stationary Perturbation Determinants in SPECTRAL METHODS FOR OPERATORS OF MATHEMATICAL PHYSICS
  • 2004 Minimal Realizations of Scalar Generalized Nevanlinna Functions Related to Their Basic Factorization in SPECTRAL METHODS FOR OPERATORS OF MATHEMATICAL PHYSICS
  • 2004 The Schur Algorithm for Generalized Schur Functions IV: Unitary Realizations in CURRENT TRENDS IN OPERATOR THEORY AND ITS APPLICATIONS
  • 2003-01 The Schur Algorithm for Generalized Schur Functions II: Jordan Chains and Transformations of Characteristic Functions in MONATSHEFTE FÜR MATHEMATIK
  • 2003 A Basic Interpolation Problem for Generalized Schur Functions and Coisometric Realizations in REPRODUCING KERNEL SPACES AND APPLICATIONS
  • 2002 List of Publications of Peter Lancaster in LINEAR OPERATORS AND MATRICES
  • 2002 Invariant Subspaces of Infinite Dimensional Hamiltonians and Solutions of the Corresponding Riccati Equations in LINEAR OPERATORS AND MATRICES
  • 2001-06 Compact perturbation of definite type spectra of self-adjoint quadratic operator pencils in INTEGRAL EQUATIONS AND OPERATOR THEORY
  • 2001 The Schur algorithm for generalized Schur functions I: coisometric realizations in SYSTEMS, APPROXIMATION, SINGULAR INTEGRAL OPERATORS, AND RELATED TOPICS
  • 2001 A relation for the spectral shift function of two self-adjoint extensions in RECENT ADVANCES IN OPERATOR THEORY AND RELATED TOPICS
  • 2001 Diagonalization of Certain Block Operator Matrices and Applications to Dirac Operators in OPERATOR THEORY AND ANALYSIS
  • 2001 Corners of Numerical Ranges in RECENT ADVANCES IN OPERATOR THEORY
  • 2000-06 Variational principles for real eigenvalues of self-adjoint operator pencils in INTEGRAL EQUATIONS AND OPERATOR THEORY
  • 2000-03 A factorization result for generalized Nevanlinna functions of the classNk in INTEGRAL EQUATIONS AND OPERATOR THEORY
  • 2000 Classical Nevanlinna-Pick Interpolation with Real Interpolation Points in OPERATOR THEORY AND INTERPOLATION
  • 2000 Linearization and Compact Perturbation of Self-adjoint Analytic Operator Functions in OPERATOR THEORY AND RELATED TOPICS
  • 2000 About the Mark Krein International Conference in DIFFERENTIAL OPERATORS AND RELATED TOPICS
  • 2000 Self-adjoint Operators with Inner Singularities and Pontryagin Spaces in OPERATOR THEORY AND RELATED TOPICS
  • 1998 Resolvents of symmetric sperators and the degenerated Nevanlinna-Pick problem in RECENT PROGRESS IN OPERATOR THEORY
  • 1997-07 Locally definite operators in indefinite inner product spaces in MATHEMATISCHE ANNALEN
  • 1997-03 Instability of singular critical points of definitizable operators in INTEGRAL EQUATIONS AND OPERATOR THEORY
  • 1997 Notes on a Nevanlinna-Pick interpolation problem for generalized Nevanlinna functions in TOPICS IN INTERPOLATION THEORY
  • 1996-09 Spectral properties of a compactly perturbed linear span of projections in INTEGRAL EQUATIONS AND OPERATOR THEORY
  • 1996 Elliptic Problems Involving an Indefinite Weight Function in RECENT DEVELOPMENTS IN OPERATOR THEORY AND ITS APPLICATIONS
  • 1995 Selfadjoint Extensions of a Closed Linear Relation of Defect One in a Krein Space in OPERATOR THEORY AND BOUNDARY EIGENVALUE PROBLEMS
  • 1994-01 On M. G. Krein's papers in the theory of spaces with an indefinite metric in UKRAINIAN MATHEMATICAL JOURNAL
  • 1993-12 Leading coefficients of the eigenvalues of perturbed analytic matrix functions in INTEGRAL EQUATIONS AND OPERATOR THEORY
  • 1993-08 Expansions of analytic functions in products of Bessel functions in RESULTS IN MATHEMATICS
  • 1992-09 Remarks on the perturbation of analytic matrix functions III in INTEGRAL EQUATIONS AND OPERATOR THEORY
  • Affiliations

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