37Kxx | 37J | 37 | 37L |
| 37K05 | Hamiltonian structures, symmetries, variational principles, conservation laws |
| 37K10 | Completely integrable systems, integrability tests, bi-Hamiltonian structures, hierarchies (KdV, KP, Toda, etc.) |
| 37K15 | Integration of completely integrable systems by inverse spectral and scattering methods |
| 37K20 | Relations with algebraic geometry, complex analysis, special functions [See also 14H70] |
| 37K25 | Relations with differential geometry |
| 37K30 | Relations with infinite-dimensional Lie algebras and other algebraic structures |
| 37K35 | Lie-Bäcklund and other transformations |
| 37K40 | Soliton theory, asymptotic behavior of solutions |
| 37K45 | Stability problems |
| 37K50 | Bifurcation problems |
| 37K55 | Perturbations, KAM for infinite-dimensional systems |
| 37K60 | Lattice dynamics [See also 37L60] |
| 37K65 | Hamiltonian systems on groups of diffeomorphisms and on manifolds of mappings and metrics |
| 37K99 | None of the above, but in this section |