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Bulletin of the American Mathematical Society

ISSN 1088-9485(online) ISSN 0273-0979(print)

 

 

Every planar map is four colorable


Authors: K. Appel and W. Haken
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
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References [Enhancements On Off] (What's this?)

  • 1. . F. Allaire and E. R. Swart, A systematic approach to the determination of reducible configurations, J. Combinatorial Theory Ser. B (to appear).
  • 2. K. Appel and W. Haken, The existence of unavoidable sets of geographically good configurations, Illinois J. Math. 20 (1976), no. 2, 218–297. MR 0392641
  • 3. Heinrich Heesch, Untersuchungen zum Vierfarbenproblem, B. I. Hochschulskripten, vol. 810/810, Bibliographisches Institut, Mannheim-Vienna-Zürich, 1969 (German). MR 0248048
  • 4. Hassler Whitney and W. T. Tutte, Kempe chains and the four colour problem, Utilitas Math. 2 (1972), 241–281. MR 0309782

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DOI: https://doi.org/10.1090/S0002-9904-1976-14122-5