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A note on chromatic number of direct product of graphs. (English) Zbl 0536.05025
Suppose that the chromatic number of the (finite, simple) graphs G, H is k. A sufficient condition is given in order that the chromatic number of their (weak) direct product should be also k.
Reviewer: A.Ádám

MSC:
05C15 Coloring of graphs and hypergraphs
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