Journal
TRANSFORMATION GROUPS
Volume 10, Issue 1, Pages 63-132Publisher
SPRINGER BIRKHAUSER
DOI: 10.1007/s00031-005-1003-y
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We consider two important families of BCn-symmetric polynomials, namely Okounkov's interpolation polynomials and Koornwinder's orthogonal polynomials. We give a family of difference equations satisfied by the former as well as generalizations of the branching ride and Pieri identity, leading to a number of multivariate q-analogues of classical hypergeometric transformations. For the latter, we give new proofs of Macdonald's conjectures, as well as new identities, including an inverse binomial formula and several branching rule and connection coefficient identities. We also derive families of ordinary symmetric functions that reduce to the interpolation and Koornwinder polynomials upon appropriate specialization. As an application. we consider a number of new integral conjectures associated to classical symmetric spaces.
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