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, 20Lxx, 20Mxx}
- 18B99 None of the above but in this section
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