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Mathematical Sciences Classification System

20Lxx - 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}

• 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}
• 20L99
  None of the above, but in this section