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The twisted Satake isomorphism and Casselman-Shalika formula
Published 29 Jul 2013 in math.RT | (1307.7510v2)
Abstract: For an arbitrary split adjoint group we identify the unramified Whittaker space with the space of skew-invariant functions on the lattice of coweights and deduce from it the Casselman-Shalika formula.
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