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# [Answers] Relationship between Coloring a graph and its complement

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Problem Detail:

Let $G = (V, E)$ be a graph and $G^*$ its edge complement (that is, $G^* = (V, E^*)$, where an edge $\{u, v\} \in E^* \Leftrightarrow \{u, v\} \not \in E$).

What is the relationship between a coloring in $G$ and a coloring in $G^*$ ?

I was expecting something like

"If $G$ accepts a $k$-coloring, than $G^*$ accepts a $(n - k)$-coloring"

but I can't prove that.

(Of course, I am dealing with proper coloring)

Sorry, this is false:

For example, take $G$ as a size-$10$ independent set. It has a $1$-coloring, or even a $3$-coloring... its complement is a clique, which admits neither a $9$- nor $7$-coloring.

Question Source : http://cs.stackexchange.com/questions/63414

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