An existence theorem for planar maps. (English) Zbl 0259.05103


05C10 Planar graphs; geometric and topological aspects of graph theory
57M15 Relations of low-dimensional topology with graph theory
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[1] Heesch, H., (Untersuchungen zum Vierfarbenproblem, B-I-Hochschulskripten 810/810a/810b (1969), Bibliographisches Institut: Bibliographisches Institut Mannheim/Vienna/Zurich)
[2] Heesch, H., Chromatic reduction of the triangulations \(T_e, e = e_5 + e_7\), J. Combinatorial Theory, 13, 46-55 (1972) · Zbl 0242.05110
[3] Ore, O., (The Four-Color Problem (1967), Academic Press: Academic Press New York/London) · Zbl 0149.21101
[4] Ore, O.; Stemple, J., Numerical calculations on the four-color problem, J. Combinatorial Theory, 8, 65-78 (1970) · Zbl 0187.45503
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