34XX ORDINARY DIFFERENTIAL EQUATIONS
 3400 General reference works (handbooks, dictionaries, bibliographies, etc.)
 3401 Instructional exposition (textbooks, tutorial papers, etc.)
 3402 Research exposition (monographs, survey articles)
 3403 Historical (must also be assigned at least one classification number from Section 01)
 3404 Explicit machine computation and programs (not the theory of computation or programming)
 3406 Proceedings, conferences, collections, etc.

34Axx General theory
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 34Bxx Boundary value problems (For ordinary differential operators, see 34Lxx)
 34Cxx Qualitative theory [See also 37XX]
 34Dxx Stability theory [See also 37C75, 93Dxx]
 34Exx Asymptotic theory
 34Fxx Equations and systems with randomness [See also 34K50, 60H10, 93E03]
 34Gxx Differential equations in abstract spaces [See also 34Lxx, 37Kxx, 47Dxx, 47Hxx, 47Jxx, 58D25]
 34Hxx Control problems [See also 49J15, 49K15, 93C15]
 34Kxx Functionaldifferential and differentialdifference equations [See also 37XX]
 34Lxx Ordinary differential operators [See also 47E05]
 34Mxx Differential equations in the complex domain [See also 30Dxx, 32G34]
 34Nxx Dynamic equations on time scales or measure chains (For real analysis on time scales see 26E60)