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Every planar map is four colorable. (English) Zbl 0357.05043


MSC:

05C15 Coloring of graphs and hypergraphs
05-02 Research exposition (monographs, survey articles) pertaining to combinatorics
05-03 History of combinatorics
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Online Encyclopedia of Integer Sequences:

Chromatic number (or Heawood number) Chi(n) of surface of genus n.