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Nov 16, 2010 at 13:37 comment added Jim Humphreys This recent preprint is intriguing but seems to require a lengthy detour through prime characteristic. Ben's original question should have a more direct answer (?), though probably not in the concise published form wanted. Anyway, the singular/parabolic interplay is important and still somewhat mysterious-looking to me; I guess it originates in Soergel's early work and independent work by Beilinson-Ginzburg.
Nov 16, 2010 at 9:21 history edited Simon Wadsley CC BY-SA 2.5
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Nov 16, 2010 at 2:57 comment added S. Carnahan It is usually better to post a link to the abstract: arxiv.org/abs/1011.0896
Nov 15, 2010 at 20:09 history answered Simon Wadsley CC BY-SA 2.5