DLMF:18.23.E2 (Q5903)

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DLMF:18.23.E2
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    F 0 2 ( - x , - x + β + N + 1 - ; - z ) F 0 2 ( x - N , x + α + 1 - ; z ) = n = 0 N ( - N ) n ( α + 1 ) n n ! Q n ( x ; α , β , N ) z n , Gauss-hypergeometric-pFq 2 0 𝑥 𝑥 𝛽 𝑁 1 𝑧 Gauss-hypergeometric-pFq 2 0 𝑥 𝑁 𝑥 𝛼 1 𝑧 superscript subscript 𝑛 0 𝑁 Pochhammer 𝑁 𝑛 Pochhammer 𝛼 1 𝑛 𝑛 Hahn-polynomial-Q 𝑛 𝑥 𝛼 𝛽 𝑁 superscript 𝑧 𝑛 {\displaystyle{\displaystyle{{}_{2}F_{0}}\left({-x,-x+\beta+N+1\atop-};-z% \right)\*{{}_{2}F_{0}}\left({x-N,x+\alpha+1\atop-};z\right)=\sum_{n=0}^{N}% \frac{{\left(-N\right)_{n}}{\left(\alpha+1\right)_{n}}}{n!}Q_{n}\left(x;\alpha% ,\beta,N\right)z^{n},}}
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    DLMF:18.23.E2
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    x = 0 , 1 , , N 𝑥 0 1 𝑁 {\displaystyle{\displaystyle x=0,1,\dots,N}}
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    F q p ( a 1 , , a p ; b 1 , , b q ; z ) Gauss-hypergeometric-pFq 𝑝 𝑞 subscript 𝑎 1 subscript 𝑎 𝑝 subscript 𝑏 1 subscript 𝑏 𝑞 𝑧 {\displaystyle{\displaystyle{{}_{\NVar{p}}F_{\NVar{q}}}\left(\NVar{a_{1},\dots% ,a_{p}};\NVar{b_{1},\dots,b_{q}};\NVar{z}\right)}}
    C16.S2.m1adec
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    Q n ( x ; α , β , N ) Hahn-polynomial-Q 𝑛 𝑥 𝛼 𝛽 𝑁 {\displaystyle{\displaystyle Q_{\NVar{n}}\left(\NVar{x};\NVar{\alpha},\NVar{% \beta},\NVar{N}\right)}}
    C18.S19.T1.t1.r2.m1aadec
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    ( a ) n Pochhammer 𝑎 𝑛 {\displaystyle{\displaystyle{\left(\NVar{a}\right)_{\NVar{n}}}}}
    C5.S2.SS3.m1aadec
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    ! {\displaystyle{\displaystyle!}}
    introduction.Sx4.p1.t1.r15.m5aadec
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    z 𝑧 {\displaystyle{\displaystyle z}}
    C18.S1.XMD2.m1adec
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    n 𝑛 {\displaystyle{\displaystyle n}}
    C18.S1.XMD6.m1adec
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    N 𝑁 {\displaystyle{\displaystyle N}}
    C18.S1.XMD7.m1adec
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    x 𝑥 {\displaystyle{\displaystyle x}}
    C18.S2.XMD3.m1adec
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