- The Four Color Theorem This page gives a brief summary of a new proof of the Four Color Theorem and a four-coloring algorithm found by Neil Robertson, Daniel P. Sanders, Paul Seymour and Robin Thomas. Table of Contents: History. Why a new proof Outline of the proof. Main features of our proof. Configurations. Discharging rules. Pointers. A quadratic algorithm. Discussion. References. History.math.gatech.edu/~thomas/FC/fourcolor.html
- The four colour theorem Geometry and topology index History Topics Index The Four Colour Conjecture first seems to have been made by Francis Guthrie. He was a student at University College London where he studied under De Morgan. After graduating from London he studied law but by this time his brother Frederick Guthrie had become a student of De Morgan. Francis Guthrie showed his brother some ...www-groups.dcs.st-and.ac.uk/~history/HistTopics/The_four_colour_theorem.html