18-XX Category theory, homological algebra
- 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 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.
- 18Axx General theory of categories and functors
- 18Bxx Special categories
- 18Cxx Categories and algebraic theories
- 18Dxx Categories with structure
- 18Exx Abelian categories
- 18Fxx Categories and geometry
- 18Gxx Homological algebra, see also {13Dxx, 16Exx, 55Uxx}