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

On the pseudospectra of Berezin-Toeplitz operators

On the regularity of the Hausdorff distance between spectra of perturbed magnetic Hamiltonians

On the resolvent of the Dirac operator in $\Bbb R^2$

On the resonances and eigenvalues for a 1D half-crystal with localised impurity

On the resonances of convex co-compact subgroups of arithmetic groups

On the Riesz Basis Property of the Eigen- and Associated Functions of Periodic and Antiperiodic Sturm-Liouville Problems

On the second largest eigenvalue of the signless Laplacian

On the sharpness of a certain spectral stability estimate for the Dirichlet Laplacian

On the similarity of Sturm-Liouville operators with non-Hermitian boundary conditions to self-adjoint and normal operators