Colorful Polynomial Explorations
Author: Paul Kehle
Since the work of Appel and Haken in 1976, we have known that no map will require more than four colors if countries that share a border must receive different colors. Their proof finally resolved a conjecture first made in 1852. The history of the four-color theorem is fascinating and very accessible in Wilson's Four Colors Suffice: How the Map Problem Was Solved.
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