Actually, I think Kempe chain is the most beautiful part in proving

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送交者: mangolasi 于 2006-08-10, 16:44:05:

回答: 图论中有一个五色定理,不是很难. 由 maths 于 2006-08-10, 13:48:39:

the 4 color problem, though it can only stop at 5 colors.

The computer-based proof is a bit less valuable in terms of aesthetics.



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