On the Hersch-Payne-Schiffer inequalities for Steklov eigenvalues

On the Hill's Operator with Matrix Potential

On the Inner Radius of Nodal Domains

On the instability of eigenvalues

On the invariant spectrum of $S^1$-invariant metrics on $S^2$

On the inverse scattering problem for Jacobi matrices with the spectrum on an interval, a finite system of intervals or a Cantor set of positive length

On the Koplienko spectral shift function, I. Basics

On the limit behaviour of second order relative spectra of self-adjoint operators

On the Measure of the Absolutely Continuous Spectrum for Jacobi Matrices

On the minimization of Dirichlet eigenvalues of the Laplace operator

On the near periodicity of eigenvalues of Toeplitz matrices

On the negative spectrum of two-dimensional Schrödinger operators with radial potentials

On the Neumann problem for Sturm-Liouville equation with self-similar Cantor type weight

On the Noncommutative Residue and the Heat Trace Expansion on Conic Manifolds

On the Nonself-adjoint Sturm-Liouville Operator with Matrix Potential

On the Number of Eigenvalues of Jacobi Operators

On the Number of Negative Spectrum of One-Dimensional Schrödinger Operators with Point Interactions

On the oscillation properties of eigenfunctions of Sturm--Liouville problem with singular coefficients

On the point spectrum of some perturbed differential operators with periodic coefficients

On the principal eigenvalue of a Robin problem with a large parameter