DLMF:8.21.E4 (Q2725)

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DLMF:8.21.E4
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    si ( a , z ) = z t a - 1 sin t d t , generalized-sine-integral-si 𝑎 𝑧 superscript subscript 𝑧 superscript 𝑡 𝑎 1 𝑡 𝑡 {\displaystyle{\displaystyle\mathrm{si}\left(a,z\right)=\int_{z}^{\infty}t^{a-% 1}\sin t\mathrm{d}t,}}
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    a < 1 𝑎 1 {\displaystyle{\displaystyle\Re a<1}}
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