DLMF:6.2.E6 (Q2216)

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DLMF:6.2.E6
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    Statements

    test
    Ei ⁡ ( - x ) = - ∫ x ∞ e - t t ⁢ d t = - E 1 ⁡ ( x ) , exponential-integral-Ei 𝑥 superscript subscript 𝑥 superscript 𝑒 𝑡 𝑡 𝑡 exponential-integral 𝑥 {\displaystyle{\displaystyle\mathrm{Ei}\left(-x\right)=-\int_{x}^{\infty}\frac% {e^{-t}}{t}\mathrm{d}t=-E_{1}\left(x\right),}}
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    DLMF id
    DLMF:6.2.E6
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