# Chromatic Graph Theory at BiggerBooks.com by Gary Chartrand, Ping Zhang

By Gary Chartrand, Ping Zhang

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**Sample text**

G r y g y b r y R b r b g g y r Figure 13: The Errera example In addition to the counterexample to Kempe’s proof, Heawood’s paper contained several interesting results, observations, and comments. For example, although Kempe’s attempted proof of the Four Color Theorem was incorrect, Heawood was able to use this approach to show that the regions of every map could be colored with five or fewer colors so that neighboring regions were colored differently (see Chapter 8).

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