| 34M05 | Entire and meromorphic solutions |
| 34M10 | Oscillation, growth of solutions |
| 34M15 | Algebraic aspects (differential-algebraic, hypertranscendence, group-theoretical) |
| 34M20 | Nonanalytic aspects |
| 34M25 | Formal solutions, transform techniques |
| 34M30 | Asymptotics, summation methods |
| 34M35 | Singularities, monodromy, local behavior of solutions, normal forms |
| 34M37 | Resurgence phenomena |
| 34M40 | Stokes phenomena and connection problems (linear and nonlinear) |
| 34M45 | Differential equations on complex manifolds |
| 34M50 | Inverse problems (Riemann-Hilbert, inverse differential Galois, etc.) |
| 34M55 | Painlevé and other special equations; classification, hierarchies; isomonodromic deformations |
| 34M60 | Singular perturbation problems in the complex domain (complex WKB, turning points, steepest descent) [See also 34E20] |
| 34M99 | None of the above, but in this section |