Four Color Theorem

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Four Color

Four coloring and graph representation of the United States.

Basic Description

How many colors are needed to color the territories of a map, if all the territories that share a border must be of different colors?

It turns out that only four colors are needed to color such a two-dimensional map. It has taken over a century for a correct proof of this fact to emerge, and the proof can currently only be carried out with the aid of computers.

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