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34-XX Ordinary differential equations → ZMATH

34Lxx Ordinary differential operators [See also 47E05] → ZMATH

34L05 General spectral theory → ZMATH

34L10 Eigenfunction expansions, completeness of eigenfunctions → ZMATH

34L15 Estimation of eigenvalues, upper and lower bounds → ZMATH

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

34L20 Asymptotic distribution of eigenvalues, asymptotic theory of eigenfunctions → ZMATH

34L25 Scattering theory → ZMATH

34L30 Nonlinear ordinary differential operators → ZMATH

34L40 Particular operators (Dirac, one-dimensional Schrödinger, etc.) → ZMATH

34L99 None of the above, but in this section → ZMATH