Christopher, I hadn't read anything else, hence assumed the problem was solved. Dr. Taylor's idea of starting from the "edge" regions can be combined with coloring of "non-touching" regions with the same color to get the germ of a proof. Please e-mail any efforts you have to the list. Thanks, Ben
> Date: Fri, 26 Apr 2013 04:10:46 -0400 > From: firstname.lastname@example.org > To: email@example.com > Subject: Re: Discrete Math > > Had that same question too. Please help us.