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May 24, 2010 at 16:07 comment added Jan Weidner Thanks, these were more or less the examples I toyed around with before asking this question (at least morally, I took k[x,y] which is not local and played with exts between k[x,y],k[x,y]/(x) and k[x,y]/(x,y) )
May 23, 2010 at 14:27 history answered Emerton CC BY-SA 2.5