Formula:KLS:09.08:14

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\HyperpFq 01 @ @ - λ + 1 2 ( x - 1 ) t 2 \HyperpFq 01 @ @ - λ + 1 2 ( x + 1 ) t 2 = n = 0 C n λ ( x ) ( 2 λ ) n ( λ + 1 2 ) n t n \HyperpFq 01 @ @ 𝜆 1 2 𝑥 1 𝑡 2 \HyperpFq 01 @ @ 𝜆 1 2 𝑥 1 𝑡 2 superscript subscript 𝑛 0 ultraspherical-Gegenbauer-polynomial 𝜆 𝑛 𝑥 Pochhammer-symbol 2 𝜆 𝑛 Pochhammer-symbol 𝜆 1 2 𝑛 superscript 𝑡 𝑛 {\displaystyle{\displaystyle{\displaystyle\HyperpFq{0}{1}@@{-}{\lambda+\frac{1% }{2}}{\frac{(x-1)t}{2}}\ \HyperpFq{0}{1}@@{-}{\lambda+\frac{1}{2}}{\frac{(x+1)% t}{2}}=\sum_{n=0}^{\infty}\frac{C^{\lambda}_{n}\left(x\right)}{{\left(2\lambda% \right)_{n}}{\left(\lambda+\frac{1}{2}\right)_{n}}}t^{n}}}}

Proof

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Symbols List

F q p subscript subscript 𝐹 𝑞 𝑝 {\displaystyle{\displaystyle{\displaystyle{{}_{p}F_{q}}}}}  : generalized hypergeometric function : http://dlmf.nist.gov/16.2#E1
Σ Σ {\displaystyle{\displaystyle{\displaystyle\Sigma}}}  : sum : http://drmf.wmflabs.org/wiki/Definition:sum
C n μ subscript superscript 𝐶 𝜇 𝑛 {\displaystyle{\displaystyle{\displaystyle C^{\mu}_{n}}}}  : ultraspherical/Gegenbauer polynomial : http://dlmf.nist.gov/18.3#T1.t1.r5
( a ) n subscript 𝑎 𝑛 {\displaystyle{\displaystyle{\displaystyle(a)_{n}}}}  : Pochhammer symbol : http://dlmf.nist.gov/5.2#iii

Bibliography

Equation in Section 9.8 of KLS.

URL links

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