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This paper discusses from a historical standpoint the incomplete reasoning of Book I proposition 9 of Archimedes' On the sphere and cylinder and gives a proof, which only uses means available to Archimedes himself. This paper also discusses some demonstrations which, through the centuries, have been proposed to solve this problem. One of these is the previously unpublished proof by Jakob I Bernoulli, which is here reported, recently discovered at the Universitätsbibliothek of Basel.
C’est un article sur les publications mathématiques pendant l’Occupation (1940–44). À travers les cas de quatre mathématiciens, et surtout de celui de Jacques Feldbau (un des fondateurs de la théorie des fibrés, mort en déportation), nous étudions la façon dont la censure a frappé les mathématiciens français définis comme juifs par le « Statut des juifs » d’octobre 1940 et les stratégies de publication que ceux-ci ont alors utilisées (pseudonymes, plis cachetés, journaux provinciaux...) La manière...
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