J Jose27 MHF Hall of Honor Apr 2009 721 310 México Jul 23, 2010 #2 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. Reactions: Ackbeet

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.