DLMF:6.8.E1 (Q2270)

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DLMF:6.8.E1
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    Defining formula
    1 2 ⁢ ln ⁡ ( 1 + 2 x ) < e x ⁢ E 1 ⁡ ( x ) < ln ⁡ ( 1 + 1 x ) , 1 2 1 2 𝑥 superscript 𝑒 𝑥 exponential-integral 𝑥 1 1 𝑥 {\displaystyle{\displaystyle\frac{1}{2}\ln\left(1+\frac{2}{x}\right)<e^{x}E_{1% }\left(x\right)<\ln\left(1+\frac{1}{x}\right),}}
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    DLMF id
    DLMF:6.8.E1
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