Christoffel–Darboux formula
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1: 18.2 General Orthogonal Polynomials
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§18.2(v) Christoffel–Darboux Formula
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… ►are the Christoffel numbers, see also (3.5.18). … ►Degree lowering and raising differentiation formulas and structure relations
►For a large class of OP’s there exist pairs of differentiation formulas …2: Bibliography G
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Contiguous relations and summation and transformation formulae for basic hypergeometric series.
J. Difference Equ. Appl. 19 (12), pp. 2029–2042.
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Formulas of the Dirichlet-Mehler Type.
In Fractional Calculus and its Applications, B. Ross (Ed.),
Lecture Notes in Math., Vol. 457, pp. 207–215.
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Construction of Gauss-Christoffel quadrature formulas.
Math. Comp. 22, pp. 251–270.
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Exceptional orthogonal polynomials and the Darboux transformation.
J. Phys. A 43 (43), pp. 43016, 16 pp..
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Explicit formulas for Bernoulli numbers.
Amer. Math. Monthly 79, pp. 44–51.
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3: 3.5 Quadrature
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§3.5(v) Gauss Quadrature
… ►In Gauss quadrature (also known as Gauss–Christoffel quadrature) we use (3.5.15) with nodes the zeros of , and weights given by …The are also known as Christoffel coefficients or Christoffel numbers and they are all positive. The remainder is given by … ►Gauss–Laguerre Formula
…4: Bibliography N
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On simplified asymptotic formulas for a class of Mathieu functions.
SIAM J. Math. Anal. 15 (6), pp. 1205–1213.
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On a simplified asymptotic formula for the Mathieu function of the third kind.
SIAM J. Math. Anal. 18 (6), pp. 1616–1629.
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An explicit formula for the coefficients in Laplace’s method.
Constr. Approx. 38 (3), pp. 471–487.
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Generalization of Binet’s Gamma function formulas.
Integral Transforms Spec. Funct. 24 (8), pp. 597–606.
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Géza Freud, orthogonal polynomials and Christoffel functions. A case study.
J. Approx. Theory 48 (1), pp. 3–167.
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5: 14.18 Sums
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Christoffel’s Formulas
… ►In these formulas the Legendre functions are as in §14.3(ii) with . The formulas are also valid with the Ferrers functions as in §14.3(i) with . …6: 2.10 Sums and Sequences
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§2.10(i) Euler–Maclaurin Formula
… ►This is the Euler–Maclaurin formula. Another version is the Abel–Plana formula: … ►§2.10(iv) Taylor and Laurent Coefficients: Darboux’s Method
… ►See also Flajolet and Odlyzko (1990).7: Bibliography W
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Reduction formulae for products of theta functions.
J. Res. Nat. Inst. Standards and Technology 117, pp. 297–303.
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Recursion formulae for hypergeometric functions.
Math. Comp. 22 (102), pp. 363–373.
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The method of Darboux.
J. Approximation Theory 10 (2), pp. 159–171.
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On a uniform treatment of Darboux’s method.
Constr. Approx. 21 (2), pp. 225–255.
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Quadrature formulas for oscillatory integral transforms.
Numer. Math. 39 (3), pp. 351–360.
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8: Errata
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Equations (18.2.12), (18.2.13)
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Subsection 17.9(iii)
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Paragraph Inversion Formula (in §35.2)
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Usability
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Subsection 14.18(iii)
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18.2.12
18.2.13
The left-hand sides were updated to include the definition of the Christoffel–Darboux kernel .
The title of the paragraph which was previously “Gasper’s -Analog of Clausen’s Formula” has been changed to “Gasper’s -Analog of Clausen’s Formula (16.12.2)”.
The wording was changed to make the integration variable more apparent.
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9: 19.32 Conformal Map onto a Rectangle
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►then is a Schwartz–Christoffel mapping of the open upper-half -plane onto the interior of the rectangle in the -plane with vertices
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