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Sep 12, 2010 at 5:01 vote accept David Eisenbud
Sep 12, 2010 at 5:01
Aug 6, 2010 at 1:14 comment added Tom Goodwillie This can be worked out by hand, too. I added to my answer (but did not give details).
Aug 5, 2010 at 9:53 history edited Torsten Ekedahl CC BY-SA 2.5
Fixed incorrect presentation for divided square.
Aug 5, 2010 at 8:37 history edited Torsten Ekedahl CC BY-SA 2.5
Elaboration of non-isomorphism
Aug 5, 2010 at 7:50 history edited Torsten Ekedahl CC BY-SA 2.5
Added Macaulay calculation.
Aug 5, 2010 at 6:42 history edited Torsten Ekedahl CC BY-SA 2.5
Added existence of very natural example.
Aug 4, 2010 at 13:21 history answered Torsten Ekedahl CC BY-SA 2.5