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 graphK4, and the graph resulting from the combination is the Moser spindle.
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((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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