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Thread: Does this photo disprove 4 colour theory?

  1. July 23rd 2010, 11:55 AM #1
    DanCarey
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    Does this photo disprove 4 colour theory?

    Does this photo disprove 4 colour theory?-4colour.jpg
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  2. July 23rd 2010, 12:54 PM #2
    Jose27
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    No, the four color theorem gives the existence of at least one such coloring. In your case substitue the 4 for a 2 and the 2 on the right for a 3.
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