Four Colors for a Whole Map copertina

Four Colors for a Whole Map

Four Colors for a Whole Map

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An imaginary island gets carved into strange, wiggly regions, and the challenge is simple to say but sneaky to solve: can every map be colored so no two touching regions match, using only four colors? Along the way, dots and lines turn maps into graphs, and there's a real difference between checking a few examples and proving something must always work. The answer is yes for flat maps with connected regions—and the story of how people finally became sure is stranger than the puzzle itself.
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