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Absolute planar retracts and the four colour conjecture. (English) Zbl 0267.05102


MSC:

05C10 Planar graphs; geometric and topological aspects of graph theory
57M15 Relations of low-dimensional topology with graph theory
55M15 Absolute neighborhood retracts
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References:

[1] Harary, F.: Graph theory. (1969) · Zbl 0182.57702
[2] Hell, P.: Rétractions de graphes. Ph.d. thesis (1972)
[3] Hell, P.: Retracts in graphs. The Proceedings of the capital conference on graph theory, combinatorics, and applications (June 1973)
[4] P. Hell, Retractions of bipartite graphs, to be published.
[5] Ore, O.: The four color problem. (1967) · Zbl 0149.21101
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