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Total colorings of graphs of order \(2n\) having maximum degree \(2n-2\). (English) Zbl 0771.05034
Summary: Let \(\chi_ t(G)\) and \(\Delta(G)\) denote respectively the total chromatic number and maximum degree of graph \(G\). H. P. Yap, J.-F. Wang and Z. Zhang [J. Aust. Math. Soc., Ser. A 47, No. 3, 445-452 (1989; Zbl 0702.05032)] proved that if \(G\) is a graph of order \(p\) having \(\Delta(G)\geq p-4\), then \(\chi_ t(G)\leq\Delta(G)+2\). Hilton has characterized the class of graphs \(G\) of order \(2n\) having \(\Delta(G)=2n-1\) such that \(\chi_ t(G)=\Delta(G)+2\). In this paper, we characterize the class of graphs \(G\) of order \(2n\) having \(\Delta(G)=2n- 2\) such that \(\chi_ t(G)=\Delta(G)+2\).

MSC:
05C15 Coloring of graphs and hypergraphs
05C75 Structural characterization of families of graphs
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