Abstract
Let P( G) denote the chromatic polynomial of a graph G. Two graphs G and H are chromatically equivalent, if P( G)= P( H). A set of graphs S is called a chromatic equivalence class if for any graph H that is chromatically equivalent with a graph G in S , then H∈ S . Peng et al. (Discrete Math. 172 (1997) 103–114), studied the chromatic equivalence classes of certain generalized polygon trees. In this paper, we continue that study and present a solution to Problem 2 in Koh and Teo (Discrete Math. 172 (1997) 59–78).
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