| 33-00 | General reference works (handbooks, dictionaries, bibliographies, etc.) |
| 33-01 | Instructional exposition (textbooks, tutorial papers, etc.) |
| 33-02 | Research exposition (monographs, survey articles) |
| 33-03 | Historical (must also be assigned at least one classification number from Section 01) |
| 33-04 | Explicit machine computation and programs (not the theory of computation or programming) |
| 33-06 | Proceedings, conferences, collections, etc. |
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| 33Bxx | Elementary classical functions |
| 33Cxx | Hypergeometric functions |
| 33Dxx | Basic hypergeometric functions |
| 33Exx | Other special functions |
| 33Fxx | Computational aspects |