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Nov 26, 2012 at 14:34 history made wiki Post Made Community Wiki by S. Carnahan
Nov 25, 2012 at 9:29 history edited Denis CC BY-SA 3.0
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Nov 25, 2012 at 3:55 comment added Noam D. Elkies (That's for the plane, but similar observations hold for Euclidean, affine, and projective spaces of higher dimension.)
Nov 25, 2012 at 3:54 comment added Noam D. Elkies ...and there are more symmetries: the group is sharply transitive on ordered 4-tuples of non-collinear points, while the affine group is only sharply transitive on ordered noncollinear triples, and the Euclidean group not even that.
Nov 25, 2012 at 0:59 history answered Denis CC BY-SA 3.0