Spectral Theory for Slowly Oscillating Potentials I. Jacobi Matrices.
Spectral Theory of Singular Hahn Difference Equation of the Sturm-Liouville Type
In this work, we consider the singular Hahn difference equation of the Sturm-Liouville type. We prove the existence of the spectral function for this equation. We establish Parseval equality and an expansion formula for this equation on a semi-unbounded interval.
Spectrum of a differential operator with periodic generalized potential.
Spectrum of linear difference operators and the solvability of nonlinear discrete problems.
Stark resonances for random potentials of Anderson type
Stone-reguläre Eigenwertprobleme.
Strong resonance problems for the one-dimensional -Laplacian.
Strong resonant tunneling, level repulsion and spectral type for one-dimensional adiabatic quasi-periodic Schrödinger operators
Structure of eigenvalues of multi-point boundary value problems.
Sturm-Liouville operator with general boundary conditions.
Sturm-Liouville systems are Riesz-spectral systems
The class of Sturm-Liouville systems is defined. It appears to be a subclass of Riesz-spectral systems, since it is shown that the negative of a Sturm-Liouville operator is a Riesz-spectral operator on L^2(a,b) and the infinitesimal generator of a C_0-semigroup of bounded linear operators.
Sufficient conditions for functions to form Riesz bases in and applications to nonlinear boundary-value problems.
Sur le spectre de quelques opérateurs et les variétés de Jacobi
Sur l'inégalité de Sobolev logarithmique des opérateurs de Laguerre à petit paramètre
Symmetric subspaces related to certain eigenvalue problems