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Can anyone please direct me to a paper or even a textbook which would provide a good read on how graph operations influence the chromatic number of a graph?

Thanks.

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    Perhaps you could be more specific about what you mean by graph operations. It seems that there is [a lot of them](http://en.wikipedia.org/wiki/Graph_operations).2012-09-09
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    Hi Martin, sorry I meant basic operations like the union (maximum chi of the 2 graphs, so that's simple), join, and products of graphs. Perhaps also the subdivision of a graph.2012-09-09

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