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Forum URL: http://www.cut-the-knot.org/cgi-bin/dcforum/forumctk.cgi
Forum Name: This and that
Topic ID: 685
Message ID: 2
#2, RE: 4 colour problem
Posted by Frank Bernhart on Mar-08-06 at 05:43 PM
In response to message #0
I used to have a reputation as rebutter of 4-color
proofs, but haven't time to go back to it.

Suggest you find FOUR COLORS SUFFICE by R. Wilson.
It is mostly elementary and well written.
If you are familiar with it, you can probably
debug your own "proof".