cyclides

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• Циклиды — (Cyclides) поверхности четвертого порядка, линии кривизны которых суть круги. К числу таких поверхностей принадлежит кольцевая поверхность, образуемая окружностью при вращении ее вокруг оси, заключающейся в плоскости круга, но не проходящей через …   Энциклопедический словарь Ф.А. Брокгауза и И.А. Ефрона

• Dupin cyclide — A Dupin cyclide In mathematics, a Dupin cyclide or cyclide of Dupin is any geometric inversion of any standard torus. In particular, the standard (or circular) tori are themselves examples of Dupin cyclides. They were discovered by (and named… …   Wikipedia

• Lie sphere geometry — is a geometrical theory of planar or spatial geometry in which the fundamental concept is the circle or sphere. It was introduced by Sophus Lie in the nineteenth century. [The definitive modern textbook on Lie sphere geometry is Harvnb|Cecil|1992 …   Wikipedia

• Channel surface — A section of a torus, a special case of a cyclide. The black lines are the two sheets of the focal surface, which here both degenerate to curves. The surface can be generated as envelopes of spheres centered on these lines. A channel or canal… …   Wikipedia

• cyclide — cy clide (s? kl?d), n. [Gr. ky klos circle.] (Geom.) A surface of the fourth degree, having certain special relations to spherical surfaces. The tore or anchor ring is one of the cyclides. [1913 Webster] …   The Collaborative International Dictionary of English

• Soddy's hexlet — [ ellipse.] In geometry, Soddy s hexlet is a chain of six spheres (shown in grey in Figure 1), each of which is tangent to both of its neighbors and also to three mutually tangent given spheres. In Figure 1, these three spheres are shown as an… …   Wikipedia

• Schwarznacken-Strumpfbandnatter — Östliche Schwarznacken Strumpfbandnatter Systematik Ordnung: Schuppenkriechtiere (Squamata) …   Deutsch Wikipedia

• Thamnophis cyrtopsis — Schwarznacken Strumpfbandnatter Systematik Ordnung: Schuppenkriechtiere (Squamata) Unterordnung: Schlangen (Serpentes) Familie: Nattern (Colubridae) …   Deutsch Wikipedia

• Darboux, Jean-Gaston — ▪ French mathematician born Aug. 14, 1842, Nîmes, France died Feb. 23, 1917, Paris  French mathematician who made important contributions to geometry and analysis and after whom the Darboux integral is named.       After acting as an assistant in …   Universalium

• DARBOUX (G.) — DARBOUX GASTON (1842 1917) Mathématicien français, né à Nîmes et mort à Paris. Après des études à l’École normale supérieure, Darboux fut l’assistant de J. Bertrand à la chaire de physique mathématique au Collège de France (1866 1867), puis… …   Encyclopédie Universelle

• FORME — L’histoire du concept de forme et des théories de la forme est des plus singulières. Nous vivons dans un monde constitué de formes naturelles. Celles ci sont omniprésentes dans notre environnement et dans les représentations que nous nous en… …   Encyclopédie Universelle