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four-color problem

[ fawr-kuhl-er, fohr- ]

noun

, Mathematics.
  1. 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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Word History and Origins

Origin of four-color problem1

First recorded in 1875–80

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four-colorfour-colour