A graph G has a k -neighborhood coloring, if there exists a coloring in which for each vertex of G, say v, the sum of the coloring of vertices in N(v) modulo k be non-zero. In this paper we prove that every corona and join product of two graphs has a k -neighborhood coloring for every k 3. Moreover, we provide some examples showing that there exists some corona and join graphs which do not have 2-neighborhood coloring.
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页码:805 / 811
页数:7
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