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Erschienen in:
2016 | OriginalPaper | Buchkapitel
10. Combinatorics and Finite Mathematics
verfasst von : Edward J. Barbeau
Erschienen in: University of Toronto Mathematics Competition (2001–2015)
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Abstract
The integer points on the line and the edges between them can be coloured \( 1 --(3) --2 --(1) --3 --(2) --1 \) and so on, where the edge colouring is in parentheses. Form a plane by stacking these lines unit distance apart, making sure that each vertex has a different coloured vertex above and below it; use colours 4 and 5 judiciously to colour the vertical edges. Now go to three dimensions; stack up planar lattices and struts unit distance apart, colouring each with the colours 1, 2, 3, 4, 5, while making sure that vertically adjacent vertices have separate colours, and use the colours 6 and 7 for vertical struts. Continue on.