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May 21, 2012 at 14:33 comment added A. Pascal Thanks. All of the answers were helpful, but this was the simplest and most general. About $\mathbb{A}^{n}$: of course you are right.
May 21, 2012 at 14:33 vote accept A. Pascal
May 19, 2012 at 10:51 history answered Dustin Cartwright CC BY-SA 3.0