The Four Color Map Theorem - Numberphile

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The Four Color Map Theorem (or colour!?) was a long-standing problem until it was cracked in 1976 using a "new" method... computers!

A little bit of extra footage from this: https://youtu.be/laMkuPrad3s

This video features Dr James Grime - http://jamesgrime.com
More Grime videos: http://bit.ly/grimevideos

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