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Oct 6, 2010 at 4:56 comment added Karl Schwede Long, thanks. That's very helpful.
Oct 6, 2010 at 4:56 vote accept Karl Schwede
Oct 6, 2010 at 2:39 comment added Hailong Dao Karl, the other way I know is via the monomial conjecture, the reduction to that case is elementary: you need that the extension is cyclically pure, and it's enough to use ideals gen. by powers of elements in a s.o.p. In dimension 2, monomial conjecture amounts to showing $x^ty^t \notin (x^{t+1},y^{t+1})$ for all $t>0$, $x,y$ s.o.p. Probably that has an elementary proof.
Oct 5, 2010 at 20:45 vote accept Karl Schwede
Oct 5, 2010 at 20:45
Oct 5, 2010 at 20:45 comment added Karl Schwede I looked in Mel's CBMS book before asking, but I didn't see this there. That's a very nice proof, thanks! Do you know of any other approaches?
Oct 5, 2010 at 17:58 comment added Hailong Dao May be Mel's CBMS note has a reference? Embarrassingly, I do not own a copy (-:.
Oct 5, 2010 at 17:37 history answered Hailong Dao CC BY-SA 2.5