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Two-floor buildings need eight colors

机译:两层建筑需要八种颜色

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Motivated by frequency assignment in office blocks, we study the chromatic number of the adjacency graph of a 3-dimensional parallelepiped arrangement. In the case each parallelepiped is within one floor, a direct application of the Four-Colour Theorem yields that the adjacency graph has chromatic number at most 8. We provide an example of such an arrangement needing exactly 8 colors. We also discuss bounds on the chromatic number of the adjacency graph of general arrangements of 3-dimensional parallelepipeds according to geometrical measures of the parallelepipeds (side length, total surface area or volume).
机译:根据办公大楼的频率分配,我们研究了三维平行六面体排列的邻接图的色数。如果每个平行六面体都在一个楼层内,则直接应用四色定理可得出邻接图的色数最多为8。我们提供了这样一种排列示例,它需要8种颜色。我们还将根据平行六面体的几何尺寸(边长,总表面积或体积)讨论3维平行六面体一般布置的邻接图的色数范围。

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