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Achromatic number)
In graph theory, complete coloring is the opposite of harmonious coloring in the sense that it is a vertex coloring in which every pair of colors appears on at least one pair of adjacent vertices.
The achromatic number ψ(G) of a graph G is the maximum number of colors needed for any complete coloring of G.
External links
[1] A Bibliography of Harmonious Colourings and Achromatic Number by Keith Edwards