34L10 Eigenfunctions, eigenfunction  expansions, completeness of eigenfunctions

34L15 Eigenvalues, 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, inverse scattering

34L30 Nonlinear ordinary differential operators

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

34L99 None of the above, but in this section

34Mxx Differential equations in the complex domain [See also <a href="#code:30Dxx">30Dxx</a>, <a href="#code:32G34">32G34</a>]

34M15 Algebraic aspects (differential-algebraic, hypertranscendence, group-theoretical)

34M25 Formal solutions, transform techniques

34M35 Singularities, monodromy, local behavior of solutions, normal forms

34M40 Stokes phenomena and connection problems (linear and nonlinear)

34M45 Differential equations on complex manifolds

34M50 Inverse problems (Riemann-Hilbert, inverse differential Galois, etc.)

34M55 Painlevé and other special equations; classification, hierarchies;

34M60 Singular perturbation problems in the complex domain (complex WKB, turning points, steepest descent) [See also <a href="#code:34E20">34E20</a>]

34M99 None of the above, but in this section

34Nxx Dynamic equations on time scales or measure chains {For real analysis on time scales see <a href="#code:26E70"> 26E70</a>}

34N05 Dynamic equations on time scales or measure chains {For real analysis on time scales or measure chains, see <a href="#code:26E70"> 26E70</a>}

34N99 None of the above, but in this section

35-00 General reference works (handbooks, dictionaries, bibliographies, etc.)

35-01 Instructional exposition (textbooks, tutorial papers, etc.)

35-02 Research exposition (monographs, survey articles)

35-03 Historical (must also be assigned at least one classification number from Section 01)

35-04 Explicit machine computation and programs (not the theory of computation or programming)

35-06 Proceedings, conferences, collections, etc.