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Dec 12, 2015 at 19:30 comment added Joe Silverman @Wolfgang Not my idea, of course. I saw this in some long-ago algebra class, and the professor there presumably had himself seen it in some even longer-ago algebra (or combinatorics) class.
Dec 12, 2015 at 18:36 comment added Wolfgang Clever idea to introduce $x_0$. Nice!
Dec 12, 2015 at 18:20 history answered Joe Silverman CC BY-SA 3.0