To do this one, I followed the example that Uli did in class last Thursday. It follows that and is pretty straightforward. --Podarcze 12:12, 9 February 2009 (UTC)
This might be a dumb question, but I'm a little confused about what {1,11} actually means. I thought it was just the set of the two numbers, but when I looked at the example 1 in chapter 7 I got a little confused. --Clwarner 21:11, 11 February 2009 (UTC)
