A non-commutative discrete hypergroup associated with q-disk polynomials

Details A non-commutative discrete hypergroup associated with q-disk polynomials A non-commutative discrete hypergroup associated with q-disk polynomials

1994-11-29

arxiv.org/abs/math/9411230v1

Mathematics

Quantum Algebra

Scientific paper

The aim of this paper is to give an example of a non-commutative discrete hypergroup associated with $q$-disk polynomials. These are polynomials $R_{l,m}^{(\a)}$ in two non-commuting variables which are expressed through little $q$-Jacobi polynomials and that appear, for the value $\a=n-2$, as zonal spherical functions on a quantum analogue of the homogeneous space $U(n)/U(n-1)$. This fact was first proved in [NYM] (see also [Fl]). In a previous paper [Fl] we proved an addition formula for these $q$-disk polynomials. It is this addition formula that will allow us to prove positivity of linearization coefficients in a manner similar to [Koo1], and to construct from it a DJS-hypergroup following [Koo4].

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