| 18-XX |
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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 55Nxx and 55Uxx for algebraic topology |
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18Bxx |
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Special categories |
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18B05 |
Category of sets, characterizations [See also 03-XX] |
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18B10 |
Category of relations, additive relations |
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18B15 |
Embedding theorems, universal categories [See also 18E20] |
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18B20 |
Categories of machines, automata, operative categories [See also 03D05, 68Qxx] |
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18B25 |
Topoi [See also 03G30] |
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18B30 |
Categories of topological spaces and continuous mappings [See also 54-XX] |
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18B35 |
Preorders, orders and lattices (viewed as categories) [See also 06-XX] |
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18B40 |
Groupoids, semigroupoids, semigroups, groups (viewed as categories) [See also 20Axx, 20L05, 20Mxx] |
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18B99 |
None of the above, but in this section |
