39Axx | 37 | 39 | 39B |
| 39A05 | General |
| 39A10 | Difference equations, additive |
| 39A11 | Stability and asymptotics of difference equations; oscillatory and periodic solutions, etc. |
| 39A12 | Discrete version of topics in analysis |
| 39A13 | Difference equations, scaling (q-differences) [See also 33Dxx] |
| 39A20 | Multiplicative and other generalized difference equations, e.g. of Lyness type |
| 39A70 | Difference operators [See also 47B39] |
| 39A99 | None of the above, but in this section |