| 18-XX |
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Category theory; homological algebra {For commutative rings, see 13Dxx; for associative rings, see 16Exx; for groups, see 20Jxx; for topological groups and related structures, see 57Txx; for algebraic topology, see also 55Nxx, 55Uxx} |
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18Dxx |
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Categorical structures |
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18D05 |
Double categories, $2$-categories, bicategories and generalizations |
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18D10 |
Monoidal categories (= multiplicative categories), symmetric monoidal categories, braided categories [See also 19D23] |
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18D15 |
Closed categories (closed monoidal and Cartesian closed categories, etc.) |
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18D20 |
Enriched categories (over closed or monoidal categories) |
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18D25 |
Actions of a monoidal category, tensorial strength {For functional programming, see also 68N18} |
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18D30 |
Fibered categories |
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18D35 |
Structured objects in a category (group objects, etc.) |
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18D50 |
Operads [See also 55P48] |
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18D99 |
None of the above, but in this section |
