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arXiv 2008.03266math-phmath.CAmath.MPmath.QA
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($q$ -)线性网格的Sklyanin型代数和($q$ -)para-Krawtchouk多项式

Sklyanin-like algebras for ($q$-)linear grids and ($q$-)para-Krawtchouk polynomials

Geoffroy Bergeron, Julien Gaboriaud, Luc Vinet, Alexei Zhedanov

摘要:

在线性和$q$ -线性网格上引入了S-Heun算子。这些算子是Heun算子的特例,与Sklyanin-like代数有关。连续哈恩和大$q$ -雅可比多项式是这些S-Heun算子具有自然作用的函数。我们证明了S-Heun算子既包含双谱算子又包含Kalnins和Miller结构算子。这四个结构算子实现了原Sklyanin代数的三角退化的特殊极限情况。从截断条件得到这些代数的一维表示。相应的表示基是多项式的有限族:para-Krawtchouk和$q$ -para-Krawtchouk。自然的代数解释,这些多项式已经失踪,从而获得。我们还恢复Heun算子附加到相应的双谱问题作为二次组合的S-Heun算子

英文摘要:

S-Heun operators on linear and $q$-linear grids are introduced. These operators are special cases of Heun operators and are related to Sklyanin-like algebras. The Continuous Hahn and Big $q$-Jacobi polynomials are functions on which these S-Heun operators have natural actions. We show that the S-Heun operators encompass both the bispectral operators and Kalnins and Miller's structure operators. These four structure operators realize special limit cases of the trigonometric degeneration of the original Sklyanin algebra. Finite-dimensional representations of these algebras are obtained from a truncation condition. The corresponding representation bases are finite families of polynomials: the para-Krawtchouk and $q$-para-Krawtchouk ones. A natural algebraic interpretation of these polynomials that had been missing is thus obtained. We also recover the Heun operators attached to the corresponding bispectral problems as quadratic combinations of the S-Heun operators

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