DLMF:6.5.E2 (Q2242)

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DLMF:6.5.E2
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    test
    Ei ⁡ ( x ) = - 1 2 ⁢ ( E 1 ⁡ ( - x + i ⁢ 0 ) + E 1 ⁡ ( - x - i ⁢ 0 ) ) , exponential-integral-Ei 𝑥 1 2 exponential-integral 𝑥 𝑖 0 exponential-integral 𝑥 𝑖 0 {\displaystyle{\displaystyle\mathrm{Ei}\left(x\right)=-\tfrac{1}{2}(E_{1}\left% (-x+i0\right)+E_{1}\left(-x-i0\right)),}}
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    DLMF id
    DLMF:6.5.E2
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