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A user with 8,254 edits. Account created on 25 July 2008.
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  • 17:1717:17, 17 November 2024 diff hist +696 N File:Moser spindle visual proof.svg {{Information |Description=Proof without words that the chromatic number of a plane is at least four, redrawn by CMG Lee. Each edge is of unit length. As every vertex of each triangle is connected to every other, they must be coloured differently. The top and bottom vertices of each lozenge can be the same colour. However, the bottom edge connecting the bottom vertices (purple) connects two vertices of the same colour, proving the impossibilty of a 3-colouring. |Source={{own}} |Date= |Author=...
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