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I'm looking for a geometric theorem which can be only proven using logical contraposition. I can't remember what it's called, but I faintly recall it involving a triangle and some lines.... thanks
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maybe this list can help: http://agutie.homestead.com/files/geometry_help_online.htm
edit: maybe cevas theorem of menelaos theorem?
http://en.wikipedia.org/wiki/Ceva%27s_theorem
http://en.wikipedia.org/wiki/Menelaus%27_theorem
Last edited by Kurre (2009-04-25 00:14:34)
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Thanks Kurre, I'll try to find it in the list. However, it is not Ceva's theorem or Menelaus's theorem.
I remember seeing a wikipedia page on it - it was a very advanced proof I think, but still uses Euclidean geometry somehow
Last edited by Identity (2009-04-25 00:28:56)
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