Four Color Map Problem

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Index Entry

Four Color Map Problem:

". . . The omnitriangulatability of the geodesic sphere provides in its local face-to-face rotatability the solution to the age-long challenging four-color map problem."

(Edited and rearranged- EJA)

Citations

1. RBF Ltr. to Shoji Sadao, 15 Feb. '66, p.5.