
Re: 4 colors problem
Posted:
Mar 5, 2014 7:21 PM


If we have a 2 color problem with,
a b a b a b b a b a b a
This would not be solvable when countries on the second row unite,
a b a b a b b a a a b a
The third column shows two countries colored in the same color, and the 2 color theorem fails.

