Formula:KLS:09.08:46

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U n ( x ) = ( n + 1 ) P n ( 1 2 , 1 2 ) ( x ) P n ( 1 2 , 1 2 ) ( 1 ) = ( n + 1 ) \HyperpFq 21 @ @ - n , n + 2 3 2 1 - x 2 formulae-sequence Chebyshev-polynomial-second-kind-U 𝑛 𝑥 𝑛 1 Jacobi-polynomial-P 1 2 1 2 𝑛 𝑥 Jacobi-polynomial-P 1 2 1 2 𝑛 1 𝑛 1 \HyperpFq 21 @ @ 𝑛 𝑛 2 3 2 1 𝑥 2 {\displaystyle{\displaystyle{\displaystyle U_{n}\left(x\right)=(n+1)\frac{P^{(% \frac{1}{2},\frac{1}{2})}_{n}\left(x\right)}{P^{(\frac{1}{2},\frac{1}{2})}_{n}% \left(1\right)}=(n+1)\,\HyperpFq{2}{1}@@{-n,n+2}{\frac{3}{2}}{\frac{1-x}{2}}}}}

Proof

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Symbols List

U n subscript 𝑈 𝑛 {\displaystyle{\displaystyle{\displaystyle U_{n}}}}  : Chebyshev polynomial of the second kind : http://dlmf.nist.gov/18.3#T1.t1.r11
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
F q p subscript subscript 𝐹 𝑞 𝑝 {\displaystyle{\displaystyle{\displaystyle{{}_{p}F_{q}}}}}  : generalized hypergeometric function : http://dlmf.nist.gov/16.2#E1

Bibliography

Equation in Section 9.8 of KLS.

URL links

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