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Feb 21, 2011 at 15:32 history edited David Ben-Zvi CC BY-SA 2.5
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Feb 21, 2011 at 5:18 comment added Torsten Ekedahl The center of the enveloping algebra of a reductive group is a mixed polynomial Laurent polynomial algebra so does not contain any non-trivial idempotents (or consider PBW for the whole algebra which thus has no non-trivial idempotents). However, a suitable completion will still act on finite dimensional representations and contain enough idempotents.
Feb 21, 2011 at 4:37 history edited David Ben-Zvi CC BY-SA 2.5
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Feb 21, 2011 at 3:26 history edited David Ben-Zvi CC BY-SA 2.5
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Feb 21, 2011 at 3:11 history answered David Ben-Zvi CC BY-SA 2.5