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Mar 12, 2015 at 14:23 comment added Jim Humphreys It would help to add a reference to the literature, as well as to define $\Delta$. Maybe it's also useful to spell out the case where the Weyl group is $S_n$? (Note too that the product of the $d_i$ is just the group order.)
Mar 12, 2015 at 6:07 history asked Kevin Ye CC BY-SA 3.0