Some remarks on free categories and free groupoids. (Einige Bemerkungen über freie Kategorien und freie Gruppoide.) (German) Zbl 0224.18001


18A10 Graphs, diagram schemes, precategories
18B40 Groupoids, semigroupoids, semigroups, groups (viewed as categories)
20L05 Groupoids (i.e. small categories in which all morphisms are isomorphisms)
05C20 Directed graphs (digraphs), tournaments
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