31 May
2012
31 May
'12
7:48 a.m.
I believe you can arbitrarily permute rows and/or columns without affecting the solution status of a coloring. Tom Dan Asimov writes:
Good point! I withdraw my objection.
--Dan
Ed wrote:
<< This is equivalent to a torus grid. If its a rectangle on a torus grid, it's a rectangle on the plain grid.