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Theorem: Six Color Theorem for Planar Graphs
Let $G$ be a simple, connected, planar graph. Then the chromatic number of $G$ obeys the following inequality $$\chi(G)\le 6.$$
Table of Contents
Proofs: 1
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References
Bibliography
 Aldous Joan M., Wilson Robin J.: "Graphs and Applications  An Introductory Approach", Springer, 2000