File:Hadwiger-Nelson.svg
![File:Hadwiger-Nelson.svg](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a3/Hadwiger-Nelson.svg/327px-Hadwiger-Nelson.svg.png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 03:22, 26 July 2007 | ![]() | 327 × 268 (4 KB) | David Eppstein | {{Information |Description=Hadwiger–Nelson problem: 7-coloring of the plane and 4-chromatic unit distance graph. |Source=self-made, originally for [http://www.ics.uci.edu/~eppstein/junkyard/c |
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