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Dec 14, 2011 at 7:46 vote accept Ralph
Dec 2, 2011 at 10:24 comment added Gerry Myerson @Jacques, OP specifically wrote, "a reference for an exercise in a textbook is also welcome."
Nov 30, 2011 at 0:37 comment added Jacques Carette @Gerry, interesting point. I was picturing a textbook which contains a proof of this elementary fact as an answer, not one which merely repeated the statement as being true.
Nov 29, 2011 at 22:05 comment added Gerry Myerson @Jacques, the question asked for a textbook reference, and Igor responded with a textbook reference. How is that not an answer? What would be necessary to qualify as an answer?
Nov 29, 2011 at 21:46 history edited Igor Rivin CC BY-SA 3.0
added some more verbiage
Nov 29, 2011 at 21:31 comment added Jacques Carette How is this an 'answer'? A comment, sure, but an answer?
Nov 29, 2011 at 21:26 comment added Ralph I just checked the exercises in Atiyah-McDonald but didn't find it. Maybe I've overlooked it. Though, thanks.
Nov 29, 2011 at 20:50 history answered Igor Rivin CC BY-SA 3.0