Five color theorem

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Notion

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Science and technology

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What Wikipedia says

The five color theorem is a result from graph theory that given a plane separated into regions, such as a political map of the countries of the world, the regions may be colored using no more than five colors in such a way that no two adjacent regions receive the same color.

Excerpt from the Wikipedia article “Five color theorem”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Departements de France map.svg: Superwikifan France departments 1791 (1).jpg: Original uploader was Tournachon at fr.wikipedia derivative work: QuartierLatin1968 (talk), Public domain, via Wikimedia Commons.