Every planar map is four colorable
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References
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1.. F. Allaire and E. R. Swart, A systematic approach to the determination of reducible configurations, J. Combinatorial Theory Ser. B (to appear).
- K. Appel and W. Haken, The existence of unavoidable sets of geographically good configurations, Illinois J. Math. 20 (1976), no. 2, 218–297. MR 392641, DOI 10.1215/ijm/1256049898
- Heinrich Heesch, Untersuchungen zum Vierfarbenproblem, B. I. Hochschulskripten, vol. 810/810, Bibliographisches Institut, Mannheim-Vienna-Zürich, 1969 (German). MR 0248048
- Hassler Whitney and W. T. Tutte, Kempe chains and the four colour problem, Utilitas Math. 2 (1972), 241–281. MR 309782
Additional Information
- Journal: Bull. Amer. Math. Soc. 82 (1976), 711-712
- MSC (1970): Primary 05C15
- DOI: https://doi.org/10.1090/S0002-9904-1976-14122-5
- MathSciNet review: 0424602