Formula:KLS:14.10:103

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1 ( e i θ t ; q ) \qHyperrphis 21 @ @ q 1 2 , q 1 2 e 2 i θ q q e - i θ t = n = 0 P n ( x | q ) ( q ; q ) n q 1 4 n t n 1 q-Pochhammer-symbol imaginary-unit 𝜃 𝑡 𝑞 \qHyperrphis 21 @ @ superscript 𝑞 1 2 superscript 𝑞 1 2 2 imaginary-unit 𝜃 𝑞 𝑞 imaginary-unit 𝜃 𝑡 superscript subscript 𝑛 0 continuous-q-Legendre-polynomial-P 𝑛 𝑥 𝑞 q-Pochhammer-symbol 𝑞 𝑞 𝑛 superscript 𝑞 1 4 𝑛 superscript 𝑡 𝑛 {\displaystyle{\displaystyle{\displaystyle\frac{1}{\left({\mathrm{e}^{\mathrm{% i}\theta}}t;q\right)_{\infty}}\ \qHyperrphis{2}{1}@@{q^{\frac{1}{2}},q^{\frac{% 1}{2}}{\mathrm{e}^{2\mathrm{i}\theta}}}{q}{q}{{\mathrm{e}^{-\mathrm{i}\theta}}% t}=\sum_{n=0}^{\infty}\frac{P_{n}\!\left(x|q\right)}{\left(q;q\right)_{n}q^{% \frac{1}{4}n}}t^{n}}}}

Substitution(s)

x = cos θ 𝑥 𝜃 {\displaystyle{\displaystyle{\displaystyle x=\cos\theta}}}


Proof

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Symbols List

( a ; q ) n subscript 𝑎 𝑞 𝑛 {\displaystyle{\displaystyle{\displaystyle(a;q)_{n}}}}  : q 𝑞 {\displaystyle{\displaystyle{\displaystyle q}}} -Pochhammer symbol : http://dlmf.nist.gov/5.18#i http://dlmf.nist.gov/17.2#SS1.p1
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
Σ Σ {\displaystyle{\displaystyle{\displaystyle\Sigma}}}  : sum : http://drmf.wmflabs.org/wiki/Definition:sum
P n subscript 𝑃 𝑛 {\displaystyle{\displaystyle{\displaystyle P_{n}}}}  : continuous q 𝑞 {\displaystyle{\displaystyle{\displaystyle q}}} -Legendre polynomial : http://drmf.wmflabs.org/wiki/Definition:ctsqLegendre
cos cos {\displaystyle{\displaystyle{\displaystyle\mathrm{cos}}}}  : cosine function : http://dlmf.nist.gov/4.14#E2

Bibliography

Equation in Section 14.10 of KLS.

URL links

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