20-XX |
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Group theory and generalizations |
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20Lxx |
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Groupoids (i.e. small categories in which all morphisms are isomorphisms) {For sets with a single binary operation, see 20N02; for topological groupoids, see 22A22, 58H05} |
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20L05 |
Groupoids (i.e. small categories in which all morphisms are isomorphisms) {For sets with a single binary operation, see 20N02; for topological groupoids, see 22A22, 58H05} |
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20L99 |
None of the above, but in this section |