DLMF:6.5.E3 (Q2243)

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DLMF:6.5.E3
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    Defining formula
    1 2 ⁢ ( Ei ⁡ ( x ) + E 1 ⁡ ( x ) ) = Shi ⁡ ( x ) = - i ⁢ Si ⁡ ( i ⁢ x ) , 1 2 exponential-integral-Ei 𝑥 exponential-integral 𝑥 hyperbolic-sine-integral 𝑥 𝑖 sine-integral 𝑖 𝑥 {\displaystyle{\displaystyle\tfrac{1}{2}(\mathrm{Ei}\left(x\right)+E_{1}\left(% x\right))=\mathrm{Shi}\left(x\right)=-i\mathrm{Si}\left(ix\right),}}
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    DLMF id
    DLMF:6.5.E3
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