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May 10, 2011 at 20:59 comment added Eric Naslund You beat me to it! I was going to say the four/five color theorem since this year, for a high school math circle ran at UBC, we had a lecture which stated the four color theorem, and proved the five color theorem. It went very well, and the students enjoyed it.
May 10, 2011 at 15:09 history answered Hans Parshall CC BY-SA 3.0