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May 20, 2010 at 2:26 comment added Will Jagy I'm guessing the tangent cone approach amounts to that in section 36 of the book by David Hilbert and S. Cohn-Vossen, in English "Geometry and the Imagination," the original "Anschauliche Geometrie." (1932)
May 19, 2010 at 18:51 history answered Sergei Ivanov CC BY-SA 2.5