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  • Four Color Theorem, The Open site in a new window - A brief summary of a new proof of the Four Colour Theorem and a four-colouring algorithm found by Neil Robertson, Daniel P. Sanders, Paul Seymour, and Robin Thomas.
  • Four Colour Theorem Open site in a new window - History of the first major theorem to be proved using a computer.
  • New Proof of the Four Colour Theorem Open site in a new window - Ashay Dharwadker uses Eilenberg modules, Hall matchings, Riemann surfaces, Steiner systems, and a map of Madhya Pradesh, India, to present his proof.
 



 
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