This new proof, if correct, should dispel all reasonable criticisms of the validity of the proof of this theorem. References K. Appel and W. Haken. Every planar map is four colorable. Bulletin of the American Mathematical Society, vol. K. Appel and W. Haken.
Every planar map is four colorable.
Illinois Journal of Mathematics, vol. The Four Colour Theorem Preprint, February 1994. Reprinted by Dover Publications 1986.