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Related Links (Outside this Site)The Geometry Center (University of Minesota).The Geometry Junkyard by David Eppstein (UC Irvine). Geometry from the Land of the Incas by Antonio Gutierez. Gérard Desargues (15911661)  Blaise Pascal (16231662)  Philippe de La Hire (16401718) Charles Julien Brianchon (17831864; X1803)  JeanVictor Poncelet (17881867; X1807) August Möbius (17901868)  Michel Chasles (17931880; X1812)  Jakob Steiner (17961863) Karl von Staudt (17981867)  Julius Plücker (18011868)  Arthur Cayley (18211895) Gaston Darboux (18421917)  Felix Klein (18491925)  Elie Cartan (18691951) Oswald Veblen (18801960) Wikipedia : Reciprocal polars  Projective differential geometry 

