Résumé
L’article de Karol Borsuk intitulé «Trois théorèmes sur la sphère euclidienne de dimension n» de 1933 est célèbre parce qu’il contient un résultat important, conjecturé par Stanisław Ulam, connu maintenant sous le nom de théorème de Borsuk-Ulam:
Toute application continue f: S d → ℝ d envoie deux points antipodaux de la sphère S d sur un même point de ℝ d .
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Bibliographie
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