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Universality property of free groupoid extensions of halfgroupoids and its geometrical meaning. (English) Zbl 0327.20022

MSC:
20L05 Groupoids (i.e. small categories in which all morphisms are isomorphisms)
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References:
[1] G. E. Bates: Free loops and nets and its generalizations. Amer. Journ. Math. 69 (1947), 499-550. · Zbl 0035.01202
[2] R. H. Bruck: A survey of binary systems. Berlin-Göttingen-Heidelberg 1958. · Zbl 0081.01704
[3] T. Evans: Homomorphisms of non-associative systems. Journ. London Math. Soc. 24 (1949), 254-260. · Zbl 0034.01304
[4] W. Peremans. : Abstract algebraic systems. Rapport ZW 1949-003 of Math. Centrum Amsterdam, 12 pp.; Math. Rev. 16, 897.
[5] K. Pickert: Projektive Ebenen. Berlin-Göttingen-Heidelberg 1955. · Zbl 0066.38707
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