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►Just as the classical OPs fit into the Askeyscheme (see §18.19 and Figure 18.21.1) with Wilson and Racah polynomials on top, the Jacobi polynomials on the simplex fit into a scheme of OPs defined as products of one-variable OPs belonging to the Askeyscheme by formulas somewhat resembling (37.14.7).
However, when the one-variable OPs are taken from a higher level in the Askeyscheme, the analogues of the denominators in the arguments in (37.14.7) will be parameters depending on variables.
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►Starting from OPs in the -Askeyscheme (see §18.27(i)), similar constructions of -variable OPs can be made.
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►Published in 1985 in the Memoirs of the American Mathematical Society, it also introduced the directed graph of hypergeometric orthogonal polynomials commonly known as the Askeyscheme.
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Luke (1969b, p. 25) gives a Chebyshev expansion near infinity for the
confluent hypergeometric -function (§13.2(i)) from
which Chebyshev expansions near infinity for , ,
and follow by using (6.11.2) and
(6.11.3). Luke also includes a recursion scheme for computing the
coefficients in the expansions of the functions. If
the scheme can be used in backward direction.
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►A graphical representation of limits in §§18.7(iii), 18.21(ii), and 18.26(ii) is provided by the Askeyscheme depicted in Figure 18.21.1.
►►►Figure 18.21.1: Askeyscheme.
…It increases by one for each row ascended in the scheme, culminating with four free real parameters for the Wilson and Racah polynomials.
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Magnify
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►The four color scheme quickly indicates in which quadrant lies: the colors blue, green, red and yellow are used to indicate the first, second, third and fourth quadrants, respectively.
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