# Szeő–Askey polynomials

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##### 1: 31.5 Solutions Analytic at Three Singularities: Heun Polynomials

###### §31.5 Solutions Analytic at Three Singularities: Heun Polynomials

… ►
31.5.2
$${\mathit{Hp}}_{n,m}(a,{q}_{n,m};-n,\beta ,\gamma ,\delta ;z)=H\mathrm{\ell}(a,{q}_{n,m};-n,\beta ,\gamma ,\delta ;z)$$

►is a polynomial of degree $n$, and hence a solution of (31.2.1) that is analytic at all three finite singularities $0,1,a$.
These solutions are the *Heun polynomials*. …

##### 2: 35.4 Partitions and Zonal Polynomials

###### §35.4 Partitions and Zonal Polynomials

… ►###### Normalization

… ►###### Orthogonal Invariance

… ►###### Summation

… ►###### Mean-Value

…##### 3: 24.1 Special Notation

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►

###### Bernoulli Numbers and Polynomials

►The origin of the notation ${B}_{n}$, ${B}_{n}\left(x\right)$, is not clear. … ►###### Euler Numbers and Polynomials

… ►The notations ${E}_{n}$, ${E}_{n}\left(x\right)$, as defined in §24.2(ii), were used in Lucas (1891) and Nörlund (1924). …##### 4: 18.3 Definitions

###### §18.3 Definitions

►Table 18.3.1 provides the definitions of Jacobi, Laguerre, and Hermite polynomials via orthogonality and normalization (§§18.2(i) and 18.2(iii)). … ►For exact values of the coefficients of the Jacobi polynomials ${P}_{n}^{(\alpha ,\beta )}\left(x\right)$, the ultraspherical polynomials ${C}_{n}^{(\lambda )}\left(x\right)$, the Chebyshev polynomials ${T}_{n}\left(x\right)$ and ${U}_{n}\left(x\right)$, the Legendre polynomials ${P}_{n}\left(x\right)$, the Laguerre polynomials ${L}_{n}\left(x\right)$, and the Hermite polynomials ${H}_{n}\left(x\right)$, see Abramowitz and Stegun (1964, pp. 793–801). … ►For another version of the discrete orthogonality property of the polynomials ${T}_{n}\left(x\right)$ see (3.11.9). … ►Legendre polynomials are special cases of Legendre functions, Ferrers functions, and associated Legendre functions (§14.7(i)). …##### 5: Richard A. Askey

######
Profile

Richard A. Askey

…
►Richard A. Askey (b.
…
►Askey received his Ph.
… Wilson), introduced the Askey-Wilson polynomials.
…Another significant contribution was the Askey-Gasper inequality for Jacobi polynomials which was published in Positive Jacobi polynomial sums. II (with G.
…
##### 6: Tom H. Koornwinder

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►Koornwinder has published numerous papers on special functions, harmonic analysis, Lie groups, quantum groups, computer algebra, and their interrelations, including an interpretation of Askey–Wilson polynomials on quantum SU(2), and a five-parameter extension (the Macdonald–Koornwinder polynomials) of Macdonald’s polynomials for root systems BC.
… Askey and W.
…
►Koornwinder has been active as an officer in the SIAM Activity Group on Special Functions and Orthogonal Polynomials.
Currently he is on the editorial board for Constructive Approximation, and is editor for the volume on
…

*Multivariable Special Functions*in the ongoing Askey–Bateman book project. … ►##### 7: 18.29 Asymptotic Approximations for $q$-Hahn and Askey–Wilson Classes

###### §18.29 Asymptotic Approximations for $q$-Hahn and Askey–Wilson Classes

►Ismail (1986) gives asymptotic expansions as $n\to \mathrm{\infty}$, with $x$ and other parameters fixed, for continuous $q$-ultraspherical, big and little $q$-Jacobi, and Askey–Wilson polynomials. …For Askey–Wilson ${p}_{n}(\mathrm{cos}\theta ;a,b,c,d|q)$ the leading term is given by … ►For a uniform asymptotic expansion of the Stieltjes–Wigert polynomials, see Wang and Wong (2006). ►For asymptotic approximations to the largest zeros of the $q$-Laguerre and continuous ${q}^{-1}$-Hermite polynomials see Chen and Ismail (1998).##### 8: 18 Orthogonal Polynomials

###### Chapter 18 Orthogonal Polynomials

…##### 9: 18.21 Hahn Class: Interrelations

###### §18.21 Hahn Class: Interrelations

►###### §18.21(i) Dualities

… ►###### §18.21(ii) Limit Relations and Special Cases

… ►###### Hahn $\to $ Jacobi

… ►A graphical representation of limits in §§18.7(iii), 18.21(ii), and 18.26(ii) is provided by the*Askey scheme*depicted in Figure 18.21.1. …