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On the chromatic uniqueness of the graph \(W(n,n-2,k)\). (English) Zbl 0857.05039
For integers \(n\geq 4\) and \(k\geq 1\), \(W(n,n-2,k)\) denotes a graph constructed in the following manner: Take a wheel \(W_n\) of order \(n\) (i.e. \(W_n\) consists of a cycle \(C\) of length \(n-1\) and a vertex \(v\) incident to all vertices of \(C\)), delete an edge between \(v\) and some vertex \(u\) of \(C\), and replace \(u\) by \(k\) independent vertices \(u_1,\dots,u_k\) such that the neighbourhood of each \(u_i\) consists of the two neighbours of \(u\) in \(C\). The authors prove that \(W(n,n-2,k)\) is chromatically unique for each even \(n\geq6\) and each \(k\geq1\), i.e. each graph having the same chromatic polynomial as \(W(n,n-2,k)\) is isomorphic to \(W(n,n-2,k)\).
Reviewer: A.Huck (Hannover)

MSC:
05C15 Coloring of graphs and hypergraphs
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References:
[1] Chia, G.L.: The chromaticity of wheels with a missing spokes. Discrete Math.82, 209–212 (1990) · Zbl 0712.05025 · doi:10.1016/0012-365X(90)90326-D
[2] Dirac, G.A.: On rigid circuit graphs, Abh. Math. Sem. Univ. Hamburg,25, 71–76 (1967) · Zbl 0098.14703 · doi:10.1007/BF02992776
[3] Dong, F.M.: On the chromatic uniqueness of generalized wheel graphs, J. Mathematical Research and Exposition (in Chinese),10, 447–454 (1990) · Zbl 0774.05038
[4] Koh, K.M., Teo, K.L.: The search for chromatic unique graphs, Graphs and Combinatorics6, 259–285 (1990) · Zbl 0727.05023 · doi:10.1007/BF01787578
[5] Liu Yanpei, Graph Theory and Algorithm, (in Chinese), Chinese Academy of Sciences (1981)
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