Every planar map is four colorable

Author:

Appel K.,Haken W.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Reference4 articles.

1. 1.. F. Allaire and E. R. Swart, A systematic approach to the determination of reducible configurations, J. Combinatorial Theory Ser. B (to appear).

2. The existence of unavoidable sets of geographically good configurations;Appel, K.;Illinois J. Math.,1976

3. B. I. Hochschulskripten;Heesch, Heinrich,1969

4. Kempe chains and the four colour problem;Whitney, Hassler;Utilitas Math.,1972

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