Rainbow Coloring in Graphs Resulting from Cartesian Product
Abstract
The rainbow connection number of a connected graph G, denoted by rc(G), is the minimum number of colors needed to color the edges of G, so that every pair of vertices is connected by at least one path in which the colors of the edges are pairwise distinct. In this work we determine the rainbow connection number for the graphs Cm × Pn when m is odd and Cm × Cn when m and n have distinct parities. For the case in which n and m are odd, we prove that rc(Cm × Cn) ≤ (m+n)/2.
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