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Aug 30, 2018 at 23:58 comment added paul Monsky @LSpice Google "Monsky's Theorem" and you'll find many write-ups.
Aug 30, 2018 at 18:39 comment added LSpice @paulMonsky, do you know a reference where this is written up?
Sep 9, 2011 at 4:53 comment added paul Monsky There's a bizarre application of Sperner's lemma that's hard for high-school students (but I did give a talk to a group of them about it): one can't dissect a square into an odd number of non-overlapping triangles, all of the same area.
Sep 9, 2011 at 3:43 history answered Thierry Zell CC BY-SA 3.0