18Bxx Special categories ( 0 Dok. )

• 18B05 Category of sets, characterizations, See also {03-XX} ( 0 Dok. )
• 18B10 Category of relations, additive relations ( 0 Dok. )
• 18B15 Embedding theorems, universal categories, See also {18E20} ( 0 Dok. )
• 18B20 Categories of machines, automata, operative categories, See also {03D05, 68Qxx} ( 0 Dok. )
• 18B25 Topoi, See also {03G30} ( 0 Dok. )
• 18B30 Categories of topological spaces and continuous mappings, See also {54-XX} ( 0 Dok. )
• 18B35 Preorders, orders and lattices (viewed as categories), See also {06-XX} ( 0 Dok. )
• 18B40 Groupoids, semigroupoids, semigroups, groups (viewed as categories), See also {20Axx, 20Lxx, 20Mxx} ( 0 Dok. )
• 18B99 None of the above but in this section ( 0 Dok. )