34A05  Explicit solutions and reductions


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


34A34  Nonlinear equations and systems, general


34A35  Differential equations of infinite order


34A36  Discontinuous equations


34A37  Differential equations with impulses


34A40  Differential inequalities [See also 26D20]


34A45  Theoretical approximation of solutions {For numerical analysis, see 65Lxx}


34A55  Inverse problems


34A60  Differential inclusions [See also 49J24, 49K24]


34A99  None of the above, but in this section

