Sur un théorème de géométrie sphérique: Théodose, ménélaüs, Ibn ʿirāq et Ibn hūd: Roshdi Rashed et Mohamad al-houjairi

Arabic Sciences and Philosophy 20 (2):207-254 (2010)
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Abstract

In his encyclopedic book, the mathematician of Saragossa, Ibn Hūd, established by an intrinsic demonstration of spherical geometry, a remarkable theorem which generalizes the proposition III.11 from Theodosius’s Spherics and integrates the propositions III.23-25 from Menelaus’s Spherics. In this paper, we study this theorem and the demonstration of Ibn Hūd. The reader will find also some established and translated texts addressing the same theme. Résumé Dans son livre encyclopédique, le mathématicien de Saragosse, Ibn Hūd, établit par une démonstration intrinsèque de la géométrie sphérique un théorème remarquable qui généralise la proposition III.11 des Sphériques de Théodose et intègre les propositions III.23-25 des Sphériques de Ménélaüs. Dans cet article, on étudie ce théorème ainsi que la démonstration d’Ibn Hūd. Le lecteur trouvera aussi établis et traduits quelques textes qui portent sur le même thème.

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