34Axx General theory
 34A05 Explicit solutions and reductions
 34A07 Fuzzy differential equations
 34A08 Fractional differential equations
 34A09 Implicit equations, differentialalgebraic equations [See also 65L80]
 34A12 Initial value problems, existence, uniqueness, continuous dependence and continuation of solutions
 34A25 Analytical theory: series, transformations, transforms, operational calculus, etc. [See also 44XX]
 34A26 Geometric methods in differential equations
 34A30 Linear equations and systems, general
 34A33 Lattice differential equations
 34A34 Nonlinear equations and systems, general
 34A35 Differential equations of infinite order
 34A36 Discontinuous equations
 34A37 Differential equations with impulses
 34A38 Hybrid systems
 34A40 Differential inequalities [See also 26D20]
 34A45 Theoretical approximation of solutions (For numerical analysis, see 65Lxx)

34A55 Inverse problems
(1)
 34A60 Differential inclusions [See also 49J21, 49K21]
 34A99 None of the above, but in this section