L'idée De Dimension Chez Al-Sijzī

Arabic Sciences and Philosophy 3 (2):251 (1993)
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Abstract

This paper presents the Arabic text, the French translation and an analysis of al-Sijzīʼs treatise, the Book of Measurement of Spheres by Spheres. In this text, al-Sijzī divides the cube into several sub-cubes and parallelopipedes, thus offering us a stereometric interpretation of algebraic identities of the third degree usually credited to mathematicians of the sixteenth and seventeenth centuries. However, this was not al-Sijzīʼs motivation for writing this treatise; rather it was his theoretical interest in the Euclidian concept of the “power” of a segment, an interest which is clearly geometric rather than algebraic. This has led al-Sijzī to the notion of dimension, at least in outline. Cet article contient l'édition du texte arabe, la traduction françhise et une analyse d'un traité d'al-Sijzī, le Livre de la mesure des sphéres par les sphères. Dans ce texte, al-Syzī expose plusieurs décompositions du cube en réunions de cubes et de parallélépipédes, donnant ainsi une interprétation stéréométrique d'identités algébriques de degré 3 qu'on avait coutume d'attribuer à des mathématiciens des XVT e et XVII e siècles. Pourtant, ce n'est pas cette interprétation qui, pour l'auteur, semble avoir motivé la rédaction du traité, mais bien une réflexion théorique sur le concept euclidien de “puissance” d'un segment, réflexion de nature clairement géométrique et non pas algébrique, et qui a conduit le mathématicien à dégager, au moins en filigrane, la notion de dimension

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