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The number of edge 3-colorings of a planar cubic graph as a permanent. (English) Zbl 0281.05103

MSC:
05C15 Coloring of graphs and hypergraphs
05C10 Planar graphs; geometric and topological aspects of graph theory
05A19 Combinatorial identities, bijective combinatorics
15B36 Matrices of integers
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References:
[1] S. Fisk, Combinatorial structure on triangulations I: the structure of four colorings, to appear. · Zbl 0277.55005
[2] Ore, O., Theory of graphs, (1962), Am. Math. Soc., Providence, R.I.,
[3] Ore, O., The four color problem, (1967), Academic Press New York · Zbl 0149.21101
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