four-color problem

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four-color problem [¦fȯr ′kəl·ər ‚präb·ləm]

(mathematics)

The problem of proving the statement that, given any map in the plane, it is possible to color the regions with four colors so that any two regions with a common boundary have different colors.

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The four-color problem poses this hypothesis: Every map can be colored with at most four colors in such a way that all neighboring countries are colored differently.

Four Colors Suffice: How the Map Problem Was Solved by Science News

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