DLMF:6.2.E2 (Q2212)

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DLMF:6.2.E2
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    E 1 ( z ) = e - z 0 e - t t + z d t , exponential-integral 𝑧 superscript 𝑒 𝑧 superscript subscript 0 superscript 𝑒 𝑡 𝑡 𝑧 𝑡 {\displaystyle{\displaystyle E_{1}\left(z\right)=e^{-z}\int_{0}^{\infty}\frac{% e^{-t}}{t+z}\mathrm{d}t,}}
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