34Axx General theory

34A05  Explicit solutions and reductions
34A09  Implicit equations
34A12  Initial value problems, existence, uniqueness, continuous
               dependence and continuation of solutions
34A20  Differential equations in the complex domain, See Also 
               {30D05, 32G34}
34A25  Analytical theory: series, transformations, transforms,
               operational calculus, etc., See also {44-XX, 47E05}
34A26  Geometric methods in differential equations
34A30  Linear equations and systems
34A34  Nonlinear equations and systems, general
34A35  Differential equations of infinite order
34A37  Differential equations with impulses
34A40  Differential inequalities
34A45  Theoretical approximation of solutions
34A46  Theoretical solution methods other than approximations
34A47  Bifurcation
34A50  Numerical approximation of solutions, {For numerical
               analysis, See 65Lxx}
34A55  Inverse problems
34A60  Equations with multivalued right-hand sides, See Also 
               {49J24, 49K24}
34A65  Stiff equations
34A99  None of the above but in this section