Counting edge-Kempe-equivalence classes for 3-edge-colored cubic graphs
Counting edge-Kempe-equivalence classes for 3-edge-colored cubic graphs
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DOI:
10.1016/j.disc.2014.02.014
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发表时间:
2012-09
期刊:
影响因子:
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通讯作者:
Sarah-marie Belcastro;R. Haas
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文献类型:
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作者:
Sarah-marie Belcastro;R. Haas
Two n-edge colorings of a graph are edge-Kempe equivalent if one can be obtained from the other by a series of edge-Kempe switches. In this work we show every planar bipartite cubic graph has exactly one edge-Kempe equivalence class, when 3= χ′(G) colors are used. In contrast, we also exhibit infinite families of nonplanar bipartite cubic (and thus 3-edge colorable) graphs with a range of numbers of edge-Kempe equivalence classes when using 3 colors. These results address a question raised by Mohar.