| MSC 1991 | Number of Preprints | |
| 39-XX | Finite differences and functional equations
| - | |
| 39-00 | General reference works (handbooks, dictionaries, bibliographies, etc.)
| - | |
| 39-01 | Instructional exposition (textbooks, tutorial papers, etc.)
| - | |
| 39-02 | Research exposition (monographs, survey articles)
| - | |
| 39-03 | Historical
| - | |
| 39-04 | Explicit machine computation and programs (not the theory of computation or programming)
| - | |
| 39-06 | Proceedings, conferences, collections, etc.
| - | |
| 39Axx | Difference equations
| 18 | browse |
| 39Bxx | Functional equations
| 3 | browse |