Some links
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送交者: feelslikespring 于 2006-10-03, 20:26:15:
回答: a naive question on the 4-color theorem 由 daye 于 2006-10-03, 14:24:31:
http://www.math.utah.edu/~pa/math/4color.html
http://en.wikipedia.org/wiki/Four-Color_Theorem
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