most recent 30 from http://mathoverflow.net 2013-05-19T16:28:40Z http://mathoverflow.net/feeds/question/4844 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/4844/projective-geometry-to-solve-corelious-acceleration-and-cross-ratio HeoTo 2009-11-10T11:43:10Z 2009-11-10T11:43:10Z

<p>A particle moves in northern hemisphere with great speed horizontally. Use <strong>cross ratio</strong> to deduce the direction of the Corelious Acceleration by projection from extended complex plane to a plane. What is the angle on the plane in the Riemannian surface?</p>