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Wikenigma - an Encyclopedia of Unknowns Wikenigma - an Encyclopedia of the Unknown Wikenigma - an Encyclopaedia of Unknowns Wikenigma - an Encyclopaedia of the Unknown

Four Color Theorem

The Four Color Theorem states that given any separation of a plane into contiguous regions, producing a figure called a map, no more than four colors are required to color the regions of the map so that no two adjacent regions have the same color.

Computational tests, checking millions of possible configurations, have never found an exception. But as yet, there isn't any formal mathematical proof of this. (note that a formal proof with 5 colors was made in the late 19th century (Heawood 1890)

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