Thread: Colors on a map
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Old 06-03-2013, 12:30 AM   #2
NN5I
Carl, nn5i
 
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This is one of the oldest problems in topology, and the attempt to prove an answer occupied many mathematicians for whole careers.

Interestingly, the answer doesn't depend upon whether we intend to publish a flat map or a globe. But if the world were donut-shaped the answer would change.
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