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arXiv 2411.09040math.CA
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q-Askey方案中q与q^{-1}-对称多项式的渐近性、正交关系与对偶性

Asymptotics, orthogonality relations and duality for the $q$ and $q^{-1}$-symmetric polynomials in the $q$-Askey scheme

Howard S. Cohl, Roberto S. Costas-Santos, Xiang-Sheng Wang

AI总结:

本文综述了q-Askey方案中q与q^{-1}-对称多项式及其对偶族的已知正交关系,利用对称极限导出连续大q^{-1}-Hermite多项式的新无穷离散正交关系,并通过Darboux方法给出大阶数渐近性。

摘要:

在这篇综述中,我们总结了q-Askey方案中Askey–Wilson多项式的q与q^{-1}-对称子族及其对偶子族目前已知的正交关系。这些多项式包括连续对偶q与q^{-1}-Hahn多项式、q与q^{-1}-Al-Salam–Chihara多项式、连续大q与q^{-1}-Hermite多项式、连续q与q^{-1}-Hermite多项式,以及它们与大q-Jacobi多项式、小q-Jacobi多项式和q与q^{-1}-Bessel多项式相联系的对偶对应物。q-Askey方案中的q^{-1}-对称多项式满足不定矩问题,因此这些多项式满足无穷多个正交关系。在q^{-1}-对称族的无穷多个正交关系中,我们尝试总结目前已知的结果。这些关系分为若干类,包括连续正交关系和无穷离散(包括双边)正交关系。利用对称极限,我们为连续大q^{-1}-Hermite多项式推导出一个新的无穷离散正交关系。利用对偶关系,我们探讨了与Askey–Wilson多项式的q与q^{-1}-对称子族相关联的对偶族本身以及由这些对偶族产生的正交关系。为了完整描述这些多项式的收敛性质,我们使用Darboux方法给出了这些多项式的大阶数渐近性。为了应用Darboux方法,我们为q^{-1}-Al-Salam–Chihara多项式推导出一个具有两个自由参数的生成函数,该生成函数具有到较低q^{-1}-对称族的自然极限。

英文摘要:

In this survey we summarize the current state of known orthogonality relations for the $q$ and $q^{-1}$-symmetric and dual subfamilies of the Askey--Wilson polynomials in the $q$-Askey scheme. These polynomials are the continuous dual $q$ and $q^{-1}$-Hahn polynomials, the $q$ and $q^{-1}$-Al-Salam--Chihara polynomials, the continuous big $q$ and $q^{-1}$-Hermite polynomials and the continuous $q$ and $q^{-1}$-Hermite polynomials and their dual counterparts which are connected with the big $q$-Jacobi polynomials, the little $q$-Jacobi polynomials and the $q$ and $q^{-1}$-Bessel polynomials. The $q^{-1}$-symmetric polynomials in the $q$-Askey scheme satisfy an indeterminate moment problem, satisfying an infinite number of orthogonality relations for these polynomials. Among the infinite number of orthogonality relations for the $q^{-1}$-symmetric families, we attempt to summarize those currently known. These fall into several classes, including continuous orthogonality relations and infinite discrete (including bilateral) orthogonality relations. Using symmetric limits, we derive a new infinite discrete orthogonality relation for the continuous big $q^{-1}$-Hermite polynomials. Using duality relations, we explore orthogonality relations for and from the dual families associated with the $q$ and $q^{-1}$-symmetric subfamilies of the Askey--Wilson polynomials. In order to give a complete description of the convergence properties for these polynomials, we provide the large degree asymptotics using the Darboux method for these polynomials. In order to apply the Darboux method, we derive a generating function with two free parameters for the $q^{-1}$-Al-Salam--Chihara polynomials which has natural limits to the lower $q^{-1}$-symmetric families.

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