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four-color problem

[ fawr-kuhl-er, fohr- ]
/ ˈfɔrˈkʌl ər, ˈfoʊr- /
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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.
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Also called four-color theorem.

Origin of four-color problem

First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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