OP%E2%80%99s
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21: 18.33 Polynomials Orthogonal on the Unit Circle
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►Simon (2005a, b) gives the general theory of these OP’s in terms of monic OP’s
, see §18.33(vi).
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§18.33(iii) Connection with OP’s on the Line
… ►Let and , , be OP’s with weight functions and , respectively, on . … ►Instead of (18.33.9) one might take monic OP’s with weight function , and then express in terms of or . After a quadratic transformation (18.2.23) this would express OP’s on with an even orthogonality measure in terms of the . …22: 18.30 Associated OP’s
§18.30 Associated OP’s
… ►§18.30(vi) Corecursive Orthogonal Polynomials
… ►Note that this is the same recurrence as in (18.2.8) for the traditional OP’s, but with a different initialization. … ►Associated Monic OP’s
… ►Relationship of Monic Corecursive and Monic Associated OP’s
…23: 18.9 Recurrence Relations and Derivatives
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►For the other classical OP’s see Table 18.9.1; compare also §18.2(iv).
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►For the other classical OP’s see Table 18.9.2.
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►For the monic versions of the classical OP’s the recurrence coefficients and (there written as and , respectively) are given in §3.5(vi).
They imply the recurrence coefficients for the orthonormal versions of the classical OP’s as well, see again §3.5(vi).
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►The following three formulas change the degree but preserve the parameters, see (18.2.42)–(18.2.44) for similar formulas for more general OP’s.
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24: 18.6 Symmetry, Special Values, and Limits to Monomials
25: DLMF Project News
error generating summary26: 18.27 -Hahn Class
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►The
-hypergeometric OP’s comprise the -Hahn class (or -linear lattice class) OP’s and the Askey–Wilson class (or -quadratic lattice class) OP’s (§18.28).
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►A (nonexhaustive) classification of such systems of OP’s was made by Hahn (1949).
There are 18 families of OP’s of -Hahn class.
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►All these systems of OP’s have orthogonality properties of the form
…Some of the systems of OP’s that occur in the classification do not have a unique orthogonality property.
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27: 18.20 Hahn Class: Explicit Representations
28: 18.5 Explicit Representations
29: 18.28 Askey–Wilson Class
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►The Askey–Wilson class OP’s comprise the four-parameter families of Askey–Wilson polynomials and of -Racah polynomials, and cases of these families obtained by specialization of parameters.
The Askey–Wilson polynomials form a system of OP’s
, , that are orthogonal with respect to a weight function on a bounded interval, possibly supplemented with discrete weights on a finite set.
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►In the remainder of this section the Askey–Wilson class OP’s are defined by their -hypergeometric representations, followed by their orthogonal properties.
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►Leonard (1982) classified all (finite or infinite) discrete systems of OP’s
on a set for which there is a system of discrete OP’s
on a set such that .
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►Bannai and Ito (1984) introduced OP’s, called the Bannai–Ito polynomials which are the limit for of the -Racah polynomials.
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