Revision history of "The Four-Color Problem"

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  • curprev 12:43, 21 April 2015‎ MathAdmin talk contribs‎ 2,386 bytes +2,386‎ Created page with "In 1852, a mathematician and England law student named Francis Guthrie, while coloring a map of the counties of England, observed that at least four colors were needed to guar..."
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