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

MSC:
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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References:
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