34-00 General reference works (handbooks, dictionaries, bibliographies, etc.)
34-01 Instructional exposition (textbooks, tutorial papers, etc.)
34-02 Research exposition (monographs, survey articles)
34-03 Historical (must also be assigned at least one classification number from Section 01)
34-04 Explicit machine computation and programs (not the theory of computation or programming)
34-06 Proceedings, conferences, collections, etc.
34Axx General theory
34Bxx Boundary value problems {For ordinary differential operators, see 34Lxx}
34Cxx Qualitative theory [See also 37-XX]
34Dxx Stability theory [See also 37C75, 93Dxx]
34Exx Asymptotic theory
34F05 Equations and systems with randomness [See also 34K50, 60H10, 93E03]
34Gxx Differential equations in abstract spaces [See also 34Lxx, 37Kxx, 47Dxx, 47Hxx, 47Jxx, 58D25]
34H05 Control problems [See also 49J25, 49K25, 93C15]
34Kxx Functional-differential and differential-difference equations [See also 37-XX]
34Lxx Ordinary differential operators [See also 47E05]
34Mxx Differential equations in the complex domain [See also 30Dxx, 32G34]