Two linear transformations each tridiagonal with respect to an eigenbasis of the other; comments on the parameter array

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dc.creatorTerwilliger, Paul
dc.date2003-06-19
dc.date.accessioned2026-07-07T04:59:04Z
dc.date.available2026-07-07T04:59:04Z
dc.descriptionLet $K$ denote a field and let $V$ denote a vector space over $K$ with finite positive dimension. We consider an ordered pair of linear transformations $A:V\to V$ and $A^*:V\to V$ that satisfy conditions (i), (ii) below. (i) There exists a basis for $V$ with respect to which the matrix representing $A$ is irreducible tridiagonal and the matrix representing $A^*$ is diagonal. (ii) There exists a basis for $V$ with respect to which the matrix representing $A$ is diagonal and the matrix representing $A^*$ is irreducible tridiagonal. We call such a pair a {\it Leonard pair} on $V$. The structure of any given Leonard pair is deterined by a certain sequence of scalars called its {\it parameter array}. The set of parameter arrays is an affine algebraic variety. We give two characterizations of this variety. One involves bidiagonal matrices and the other involves orthogonal polynomials.
dc.description26 pages
dc.identifierhttps://arxiv.org/abs/math/0306291
dc.identifierhttp://arxiv.org/abs/math/0306291
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/67834
dc.subjectRings and Algebras
dc.subjectMathematical Physics
dc.subjectCombinatorics
dc.subjectQuantum Algebra
dc.subjectRepresentation Theory
dc.subject17B37; 05E30, 33C45, 33D45
dc.titleTwo linear transformations each tridiagonal with respect to an eigenbasis of the other; comments on the parameter array
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