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Proving the four color theorem

  1. Mar 13, 2007 #1
    Hello everybody!

    I have recently stumbled into the four color theorem and did some research on the internet to learn about previous attempts to prove it. I found the following statement on Wikibooks:

    (Click here for full text)

    I do not quite understand what Hamiltonian cycles have to do with it - doesn't the fact that every vertex in a graph representing a map can have no more than 3 edges already prove the four color theorem?

    Best regards,

    Matthias
     
  2. jcsd
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