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< 20Nxx | 20-XX | >
20-XX Group theory and generalizations
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}
< 20Nxx | 20-XX | >
 
 
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