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Sep 6, 2010 at 0:20 comment added Tsuyoshi Ito In the comments to the question, the questioner says that the intent is that the paper is the infinite grid ℤ×ℤ. But I think that your example is sufficient to disprove the analogous claim for arbitrary large grids, which is also interesting IMHO.
Sep 6, 2010 at 0:17 history edited Gerhard Paseman CC BY-SA 2.5
last(hopefully)tweak
Sep 6, 2010 at 0:11 history answered Gerhard Paseman CC BY-SA 2.5