Draguignan, 30 Mai 1876.
Reference : 18661
Manuscrit autographe de ce texte important publié dans le "Journal de mathématiques pures et appliquées" (le "Journal de Liouville") en 1891. Le présent manuscrit, proprement calligraphié, semble être celui communiqué par Ribaucour au "Journal de Liouville" pour sa publication. On note cependant plusieurs différences entre le texte manuscrit et l'imprimé, qui sont : - une équation a été écrite d'une manière très différente et a été rayée (p. 41 du manuscrit). - dans l'imprimé se trouve une note de bas de page qui ne figure pas dans le manuscrit (p. 102). - un paragraphe a été supprimé dans l'imprimé (p. 114, 116). - des différences importantes de notations utilisées dans les équations (p. 105, 112, 113,114 ...) La première page du manuscrit porte : "Mémoire du Journal de Liouville avec les notations de M. G. Darboux" et le premier plat de la reliure, en lettres dorées : "Mémoire sur les surfaces applicables". On joint le tiré à part de cet article, broché (défraichi), sous couverture imprimée. Paris, Gauthier-Villars, 1890. In-4 de 108 pp., 219-270 pp. Polytechnicien et Ingénieur des Ponts et Chaussées, Albert Ribaucour (1845-1893) s'est illustré par ses recherches en géométrie différentielle. On joint : - RIBAUCOUR. Etude des élassoïdes ou surfaces à courbure moyenne nulle. In-4 de (2), VI, (2), 236 pp. [Extrait des Mémoires couronnés et mémoires des savants étrangers. Académie royale des sciences, des lettres et des beaux-arts de Belgique, T. XLIV, 1881]. Demi-basane verte à coins de l'époque. /// grand in-4 de 120 pp. Demi-basane verte à coins. (Reliure de l'époque.) //// Autograph manuscript of this important text published in the Journal de mathématiques pures et appliquées (the Journal de Liouville) in 1891. This neatly written manuscript appears to be the one submitted by Ribaucour to the Journal de Liouville for publication. However, there are several differences between the manuscript and the printed text, which are: - one equation has been written in a very different way and has been crossed out (p. 41 of the manuscript). - in the printed text there is a footnote that does not appear in the manuscript (p. 102). - a paragraph has been deleted in the printed version (pp. 114, 116). - significant differences in the notation used in the equations (pp. 105, 112, 113, 114, etc.). The first page of the manuscript reads: Mémoire du Journal de Liouville avec les notations de M. G. Darboux (Memoir from the Journal de Liouville with notes by M. G. Darboux) and the front cover of the binding reads, in gold lettering: Mémoire sur les surfaces applicables (Memoir on applicable surfaces). A separate copy of this article is included, sewn with a printed cover (with few damage). Paris, Gauthier-Villars, 1890. In-4, 108 pp., 219-270 pp. A graduate of the Ecole Polytechnique and a civil engineer, Albert Ribaucour (1845-1893) was renowned for his research in differential geometry. "Ribaucour's mathemetical work - to which he dedicated himself especially under the influence of Mannheim - belonged to his spare time, expect for a short period during 1873 and 1874, when he was répétiteur in geometry at the Ecole Polytechnique. His main field was differential geometry, and his work was distinguished enough to earn him the prix Dalmont in 1877 and a posthumous prix, Petit d'Ormoy in 1895, awarded by the Paris Academy. His most elaborate work was a study of minimal surfaces, 'Etude des élassoides ou surfaces à courbure moyenne nulle', presented to the Belgian Academy of Sciences in 1880. In the work he explained his method called perimorphie, which utilized a moving trihedron on a surface. The approach to minimal surfaces was to consider them as the envelope of the middle planes of isotropic congruences; this approach led Ribaucour to a wealth of results. Many of Ribaucour's papers deal with congruences of circle and spheres. Special attention was devoted to those system of circle that are orthogonal to a family of surfaces. Such systems form systemes cycliques, and it is sufficient for the circles to be orthogonal to more than two surfaces for them to be orthogonal to a family. Ribaucours research thus led him to envelopes of spheres, to triply orthogonal system, cyclides, and surfaces of constant curvature". Stuick, DSB 11, 398. With : - - RIBAUCOUR. Etude des élassoïdes ou surfaces à courbure moyenne nulle. In-4 de (2), VI, (2), 236 pp. [Extrait des Mémoires couronnés et mémoires des savants étrangers. Académie royale des sciences, des lettres et des beaux-arts de Belgique, T. XLIV, 1881]. Contemporary green half-basane with corners. /// PLUS DE PHOTOS SUR WWW.LATUDE.NET
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