34L05  General spectral theory


34L10  Eigenfunction expansions, completeness of eigenfunctions


34L15  Estimation of eigenvalues, upper and lower bounds


34L16  Numerical approximation of eigenvalues and of other parts of the spectrum


34L20  Asymptotic distribution of eigenvalues, asymptotic theory of eigenfunctions


34L25  Scattering theory


34L30  Nonlinear ordinary differential operators


34L40  Particular operators (Dirac, onedimensional Schrödinger, etc.)


34L99  None of the above, but in this section

