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Nov 28, 2012 at 17:24 comment added Ray Hoobler Yes. You are right. I was thinking only about the isomorphism on points, not the fiber!
Nov 26, 2012 at 9:39 comment added R.P. Fiber above the cusp is not reduced.
Nov 25, 2012 at 21:39 history answered Ray Hoobler CC BY-SA 3.0