Askey-Wilson relations and Leonard pairs

Details Askey-Wilson relations and Leonard pairs Askey-Wilson relations and Leonard pairs

2005-11-21

arxiv.org/abs/math/0511509v2

Mathematics

Quantum Algebra

22 pages; corrected version; the example of Section 2 has the normalization consistent with the rest of the paper

Scientific paper

It is known that if $(A,B)$ is a Leonard pair, then the linear transformations $A$, $B$ satisfy the Askey-Wilson relations A^2 B - b A B A + B A^2 - g (A B+B A) - r B = h A^2 + w A + e I, B^2 A - b B A B + A B^2 - h (A B+B A) - s A = g B^2 + w B + f I, for some scalars $b,g,h,r,s,w,e,f$. The problem of this paper is the following: given a pair of Askey-Wilson relations as above, how many Leonard pairs are there that satisfy those relations? It turns out that the answer is 5 in general. We give the generic number of Leonard pairs for each Askey-Wilson type of Askey-Wilson relations.

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