Four colour theorem doesn't work in world map?
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In the world map, countries are not just one blob - some consist more than one blobs. For example, Alaska and mainland US are separated, and France and UK etc has overseas territories such as French Guiana. So we have more conditions to worry about, making it impossible?
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@rz923 That's a cool question! It seems that this person also wondered the same thing:
https://zyxyvy.wordpress.com/2016/07/25/is-the-world-map-four-colorable/
