Einige Bemerkungen über Graphen, Kategorien und Gruppoide. (German) Zbl 0104.01702


group theory
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[1] Ehresmann, Bericht Deutsch. Math. Verein. 60 (1957)
[2] Brandt, Math. Ann. 96 (1926)
[3] Michler, Wiss. Z. Hochsch. f. Schwermaschinenbau, Magdeburg 2 (1958)
[4] Quadratische Formen und orthogonale Gruppen. Berlin-Göttingen-Heidelberg 1952, S. 67.
[5] Malcev, Rec. Math. 6 (1939)
[6] Schreier, Abh. Math. Sem. Hamburg 5 (1927)
[7] Faktorgruppoide und homomorphe Abbildungen bei Gruppoiden. Dissertation Dresden 1960.
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