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Universal and special problems. (English) Zbl 0129.01202


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References:

[1] Bourbaki, N.: Théorie des ensembles. Paris: Hermann 1957. · Zbl 0100.27803
[2] ?: Algèbre. Paris: Hermann 1959.
[3] Ehresmann, C.: Gattungen von lokalen Strukturen. Jber. dtsch. Math.-Ver.60, 49-77 (1957). · Zbl 0097.37803
[4] Eilenberg, S., andN. Steenrod: Foundations of algebraic topology. Princeton: Princeton Univ. Press 1952. · Zbl 0047.41402
[5] Hu, S.: Homotopy Theory. New York: Academic Press 1959. · Zbl 0088.38803
[6] Sonner, J.: On the formal definition of categories. Math. Z.80, 163-176 (1962). · Zbl 0109.24202
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