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Bivariate $P$- and $Q$-polynomial structures of the association schemes based on attenuated spaces

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arxiv 2405.04586 v1 pith:HBP6WMR3 submitted 2024-05-07 math.CO

classification math.CO
keywords schemesbivariatepolynomialsalgebraassociationattenuatedbispectralpolynomial
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abstract

The bivariate $P$- and $Q$-polynomial structures of association schemes based on attenuated spaces are examined using recurrence and difference relations of the bivariate polynomials which form the eigenvalues of the scheme. These bispectral properties are obtained from contiguity relations of univariate dual $q$-Hahn and affine $q$-Krawtchouk polynomials. The bispectral algebra associated to the bivariate polynomials is investigated, as well as the subconstituent algebra of the schemes. The properties of the schemes are compared to those of the non-binary Johnson schemes through a limit.

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  1. Contiguity relations for finite families of orthogonal polynomials in the Askey scheme

    math.CA 2025-04 conditional novelty 6.0 of 10

    The paper gives a complete classification of A2, B2, and B2-prime contiguity relations for the finite Askey scheme families, and proves all A2 relations are Christoffel or Geronimus transforms.

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