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four-color problem

[fawr-kuhl-er, fohr-]
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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.

Origin of four-color problem

First recorded in 1875–80
Also called four-color theorem.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018