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Apr 30, 2011 at 13:43 history edited David E Speyer CC BY-SA 3.0
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Apr 29, 2011 at 18:10 comment added David E Speyer Lecture 2 from Schiffman's lectures on Hall algebras is pretty good. arxiv.org/abs/math/0611617
Apr 29, 2011 at 17:49 comment added Richard Borcherds Macdonald's book is a good reference for these. If I remember correctly you need to work with the symmetric functions over polynomials in q or something like that, and if you set q=1 you recover the usual symmetric functions.
Apr 29, 2011 at 17:38 comment added darij grinberg A good reference maybe?
Apr 29, 2011 at 17:05 history answered David E Speyer CC BY-SA 3.0