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Forum URL:	http://www.cut-the-knot.org/cgi-bin/dcforum/forumctk.cgi
Forum Name:	High school
Topic ID:	159
#0, A geometry problem Posted by Sprites on Apr-29-02 at 02:43 PM I am having trouble figuring out how to disprove that the following matrix has a euclidian representation. \|x\| \|x\| \| \|x\| \| \|x\| \| \| \|x\| \| \|x\| \| \|x\| \| \|x\| \| \|x\| \| \| \|x\| \| \|x\| \| \|x\| \| \|x\|x\| \| \| \| \|x\|x\| \| \| \| \|x\| \|x\| \|x\| \| \| \| \|x\| \| \|x\| \| \|x\| \|x\| \| \|x\| \| \| \| \|x\|x\|x\| \| \| \| \| \| \| \| \| \| \| \| \|x\|x\|x\| \| \| \| \| \| \| \| \| \| \| \| \|x\|x\|x\| The rule is as following: The matrix rows represent points, the matrix columns represent lines, the x'es show where a point lies on a line. No four points are collinear. I hope this problem finds you entertained. Thank you for your time. #1, RE: A geometry problem Posted by alexb on May-01-02 at 00:45 AM In response to message #0 What is the euclidean representation? #2, RE: A geometry problem Posted by jrr7 on May-03-02 at 04:26 PM In response to message #1 I searched on google.com and it appears to have something to do with projective geometry, but I can't understand what's being said.