| 18-00 | General reference works (handbooks, dictionaries, bibliographies, etc.) |
| 18-01 | Instructional exposition (textbooks, tutorial papers, etc.) |
| 18-02 | Research exposition (monographs, survey articles) |
| 18-03 | Historical (must also be assigned at least one classification number from Section 01) |
| 18-04 | Explicit machine computation and programs (not the theory of computation or programming) |
| 18-06 | Proceedings, conferences, collections, etc. |
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| 18Axx | General theory of categories and functors |
| 18Bxx | Special categories |
| 18Cxx | Categories and theories |
| 18Dxx | Categories with structure |
| 18Exx | Abelian categories |
| 18Fxx | Categories and geometry |
| 18Gxx | Homological algebra
[See also 13Dxx, 16Exx, 20Jxx, 55Nxx, 55Uxx, 57Txx] |
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