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Mar 10, 2011 at 0:19 comment added fherzig Yes, that's a good point. You listed the relevant paper of Jantzen in your answer.
Mar 10, 2011 at 0:12 comment added Jim Humphreys It's also worth recalling an earlier related question on MO: mathoverflow.net/questions/18280
Mar 9, 2011 at 23:59 history answered fherzig CC BY-SA 2.5