projective configuration
91Pappus's hexagon theorem — (attributed to Pappus of Alexandria) states that given one set of collinear points A , B , C , and another set of collinear points a , b , c , then the intersection points x , y , z of line pairs Ab and aB , Ac and aC , Bc and bC are collinear. ( …
92Luigi Cremona — Born 7 December 1830(1830 12 07) Pavia (Lombardy) …
93Dalibor Vesely — was born in Prague, Czech Republic in 1934. He studied engineering, architecture, art history and philosophy in Prague and in Munich and obtained his PhD from Charles University in Prague. He studied with Hans Georg Gadamer, with whom he kept a… …
94Rank (differential topology) — In mathematics, the rank of a differentiable map f : M → N between differentiable manifolds at a point p ∈ M is the rank of the derivative of f at p. Recall that the derivative of f at p is a linear map from the tangent space at p to the… …
95Gérard Desargues — Girard Desargues Girard Desargues Naissance 2 mars 1591 Lyon (France) Décès Octobre 1661 Lyon (France) …
96Hemipolyhedron — In geometry, a hemipolyhedron is a uniform star polyhedron some of whose faces pass through its center. These hemi faces lie parallel to the faces of some other symmetrical polyhedron, and their count is half the number of faces of that other… …
97IDENTIFICATION — Dans l’acception psychologique de la notion, la forme d’identité la plus directement accessible est celle qu’a dégagée, en rupture avec la tradition cartésienne, la critique de la substantialité du moi. «Le soi (Self ), écrit Locke, est cette… …
98Complete icosahedron — may refer to: an icosahedron which has had none of its faces removed, as opposed to a partial icosahedron such as a geodesic hemisphere Final stellation of the icosahedron, also called the complete stellation of the icosahedron In projective… …
99Torsion tensor — In differential geometry, the notion of torsion is a manner of characterizing a twist or screw of a moving frame around a curve. The torsion of a curve, as it appears in the Frenet Serret formulas, for instance, quantifies the twist of a curve… …
100SCIENCES HUMAINES — L’expression «sciences humaines» est, en France, une façon usuelle de nommer les études de psychologie et de sociologie. Depuis la Seconde Guerre mondiale, elle a remplacé l’ancienne appellation de «sciences morales». En 1942, l’ouvrage de… …
