Tolerances, covering systems, and the axiom of choice
Archivum mathematicum, Tome 25 (1989) no. 1-2, pp. 27-34 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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Grätzer, G.; Wenzel, G. H. Tolerances, covering systems, and the axiom of choice. Archivum mathematicum, Tome 25 (1989) no. 1-2, pp. 27-34. http://geodesic.mathdoc.fr/item/ARM_1989_25_1-2_a4/

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