| 34B05 | Linear boundary value problems |
| 34B07 | Linear boundary value problems with nonlinear dependence on the spectral parameter |
| 34B08 | Multi-parameter boundary value problems |
| 34B09 | Boundary value problems with an indefinite weight |
| 34B10 | Multipoint boundary value problems |
| 34B15 | Nonlinear boundary value problems |
| 34B16 | Singular nonlinear boundary value problems |
| 34B18 | Positive solutions of nonlinear boundary value problems |
| 34B20 | Weyl theory and its generalizations |
| 34B24 | Sturm-Liouville theory [See also 34Lxx] |
| 34B27 | Green functions |
| 34B30 | Special equations (Mathieu, Hill, Bessel, etc.) |
| 34B37 | Boundary value problems with impulses |
| 34B40 | Boundary value problems on infinite intervals |
| 34B45 | Boundary value problems on graphs and networks |
| 34B60 | Applications |
| 34B99 | None of the above, but in this section |