On eigenfunction approximations for typical non-self-adjoint Schroedinger operators

On eigenvalue and eigenvector estimates for nonnegative definite operators

On Explicit Recursive Formulas in the Spectral Perturbation Analysis of a Jordan Block

On exponential decay rate of semigroup associated with second order linear differential equation in Hilbert space with strong damping operator

On Factorization of a Perturbation of a J-selfadjoint Operator Arising in Fluid Dynamics

On finiteness of the sum of negative eigenvalues of Schroedinger operators

On generalized sum rules for Jacobi matrices

On Harrell-Stubbe Type Inequalities for the Discrete Spectrum of a Self-Adjoint Operator

On isospectral arithmetical spaces

On Krein's Example

On limit sets for the discrete spectrum of complex Jacobi matrices

On Local Borg-Marchenko Uniqueness Results

On location of discrete spectrum for complex Jacobi matrices

On lower eigenvalue estimates for Toeplitz operators with radial symbols in Bergman spaces

On negative eigenvalues of two-dimensional Schrödinger operators

On nodal sets and nodal domains on S^2 and R^2

On norm resolvent convergence of Schrödinger operators with $δ'$-like potentials

On one inverse problem relatively domain for the plate

On one inverse spectral problem relatively domain

On periodic boundary value problem for the Sturm-Liouville operator