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English: The Hajós construction, a method of combining pairs of graphs to produce a larger graph. If both of the smaller graphs require at least k colors in any coloring, then so does the larger graph. In this example, the two smaller graphs being combined are both copies of the complete graph K4, and the graph resulting from the combination is the Moser spindle.
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Source Own work
Author David Eppstein

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21 July 2011

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current00:31, 22 July 2011Thumbnail for version as of 00:31, 22 July 2011240 × 147 (2 KB)David Eppstein{{Information |Description ={{en|1=The en:Hajós construction, a method of combining pairs of graphs to produce a larger graph. If both of the smaller graphs require at least ''k'' colors in any coloring, then so does the larger graph. In this exa

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