Algebraic Groups and Their Generalizations: Classical Methods: Summer Research Institute on Algebraic Groups and Their Generalizations, July 6-26, 1991, Pennsylvania...
In [Mathieu 4 this dimension is determined when X belongs to the interior of the first alcove C as in 6.2(6). (If X = XD'_1 mis, then one has A e C if and only if m1 – m, < p – n + 1.) Work in [Rasmussen] leads to a calculation of this ...