Four color theorem/Definition

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https://en.citizendium.org/wiki/index.php?title=Four_color_theorem/Definition&printable=yes
A definition or brief description of Four color theorem.

A problem in cartography and mathematics when it was noticed that it only required four colors to fill in the different contiguous shapes on any map of regions or countries or provinces in a flat surface known as a plane such that no two adjacent regions with a common boundary had the same color; mathematicians proved this using computers in 1976.

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