Formula:KLS:09.08:44

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R n ( α , β ) ( x ) := P n ( α , β ) ( x ) / P n ( α , β ) ( 1 ) ω n ( α , β ) := - 1 1 ( 1 - x ) α ( 1 + x ) β 𝑑 x - 1 1 ( R n ( α , β ) ( x ) ) 2 ( 1 - x ) α ( 1 + x ) β 𝑑 x assign normalized-Jacobi-polynomial-R 𝛼 𝛽 𝑛 𝑥 Jacobi-polynomial-P 𝛼 𝛽 𝑛 𝑥 Jacobi-polynomial-P 𝛼 𝛽 𝑛 1 superscript subscript 𝜔 𝑛 𝛼 𝛽 assign superscript subscript 1 1 superscript 1 𝑥 𝛼 superscript 1 𝑥 𝛽 differential-d 𝑥 superscript subscript 1 1 superscript normalized-Jacobi-polynomial-R 𝛼 𝛽 𝑛 𝑥 2 superscript 1 𝑥 𝛼 superscript 1 𝑥 𝛽 differential-d 𝑥 {\displaystyle{\displaystyle{\displaystyle R^{(\alpha,\beta)}_{n}\left(x\right% ):=P^{(\alpha,\beta)}_{n}\left(x\right)/P^{(\alpha,\beta)}_{n}\left(1\right)% \omega_{n}^{(\alpha,\beta)}:=\frac{\int_{-1}^{1}(1-x)^{\alpha}(1+x)^{\beta}dx}% {\int_{-1}^{1}(R^{(\alpha,\beta)}_{n}\left(x\right))^{2}(1-x)^{\alpha}(1+x)^{% \beta}dx}}}}

Proof

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Symbols List

R n ( α , β ) subscript superscript 𝑅 𝛼 𝛽 𝑛 {\displaystyle{\displaystyle{\displaystyle R^{(\alpha,\beta)}_{n}}}}  : normalized Jacobi polynomial : http://drmf.wmflabs.org/wiki/Definition:normJacobiR
P n ( α , β ) subscript superscript 𝑃 𝛼 𝛽 𝑛 {\displaystyle{\displaystyle{\displaystyle P^{(\alpha,\beta)}_{n}}}}  : Jacobi polynomial : http://dlmf.nist.gov/18.3#T1.t1.r3
{\displaystyle{\displaystyle{\displaystyle\int}}}  : integral : http://dlmf.nist.gov/1.4#iv

Bibliography

Equation in Section 9.8 of KLS.

URL links

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