fourcolor theorem

four-color problem

[fawr-kuhl-er, fohr-]
noun Mathematics.
the problem, solved in 1976, of proving the theorem that any geographic map can be colored using only four colors so that no connected countries with a common boundary are colored the same color.
Also called four-color theorem.

1875–80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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