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< 18Axx | 18-XX | 18Cxx >
18-XX Category theory; homological algebra {For commutative rings see 13Dxx, for associative rings 16Exx, for groups 20Jxx, for topological groups and related structures 57Txx; see also for algebraic topology}
18Bxx Special categories
18B05   Category of sets, characterizations [See also 03-XX]
18B10   Category of relations, additive relations
18B15   Embedding theorems, universal categories [See also 18E20]
18B20   Categories of machines, automata, operative categories [See also 03D05, 68Qxx]
18B25   Topoi [See also 03G30]
18B30   Categories of topological spaces and continuous mappings [See also 54-XX]
18B35   Preorders, orders and lattices (viewed as categories) [See also 06-XX]
18B40   Groupoids, semigroupoids, semigroups, groups (viewed as categories) [See also 20Axx, 20L05, 20Mxx]
18B99   None of the above, but in this section
< 18Axx | 18-XX | 18Cxx >
 
 
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