Formula:KLS:09.08:40

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Γ ( λ + 1 ) Γ ( λ + 1 2 ) Γ ( 1 2 ) - 1 1 C n λ ( y ) C n λ ( 1 ) ( 1 - y 2 ) λ - 1 2 e i x y 𝑑 y = i n 2 λ Γ ( λ + 1 ) x - λ J λ + n ( x ) Euler-Gamma 𝜆 1 Euler-Gamma 𝜆 1 2 Euler-Gamma 1 2 superscript subscript 1 1 ultraspherical-Gegenbauer-polynomial 𝜆 𝑛 𝑦 ultraspherical-Gegenbauer-polynomial 𝜆 𝑛 1 superscript 1 superscript 𝑦 2 𝜆 1 2 imaginary-unit 𝑥 𝑦 differential-d 𝑦 imaginary-unit 𝑛 superscript 2 𝜆 Euler-Gamma 𝜆 1 superscript 𝑥 𝜆 Bessel-J 𝜆 𝑛 𝑥 {\displaystyle{\displaystyle{\displaystyle\frac{\Gamma\left(\lambda+1\right)}{% \Gamma\left(\lambda+\frac{1}{2}\right)\Gamma\left(\frac{1}{2}\right)}\int_{-1}% ^{1}\frac{C^{\lambda}_{n}\left(y\right)}{C^{\lambda}_{n}\left(1\right)}(1-y^{2% })^{\lambda-\frac{1}{2}}{\mathrm{e}^{\mathrm{i}xy}}dy={\mathrm{i}^{n}}2^{% \lambda}\Gamma\left(\lambda+1\right)x^{-\lambda}J_{\lambda+n}\left(x\right)}}}

Proof

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Symbols List

Γ Γ {\displaystyle{\displaystyle{\displaystyle\Gamma}}}  : Euler's gamma function : http://dlmf.nist.gov/5.2#E1
{\displaystyle{\displaystyle{\displaystyle\int}}}  : integral : http://dlmf.nist.gov/1.4#iv
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
e e {\displaystyle{\displaystyle{\displaystyle\mathrm{e}}}}  : the base of the natural logarithm : http://dlmf.nist.gov/4.2.E11
i i {\displaystyle{\displaystyle{\displaystyle\mathrm{i}}}}  : imaginary unit : http://dlmf.nist.gov/1.9.i
J ν subscript 𝐽 𝜈 {\displaystyle{\displaystyle{\displaystyle J_{\nu}}}}  : Bessel function of the first kind : http://dlmf.nist.gov/10.2#E2

Bibliography

Equation in Section 9.8 of KLS.

URL links

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