DLMF:2.11.E24 (Q1049)

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DLMF:2.11.E24
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    e x E 1 ( x ) s = 0 ( - 1 ) s s ! x s + 1 , asymptotic-expansion superscript 𝑒 𝑥 exponential-integral 𝑥 superscript subscript 𝑠 0 superscript 1 𝑠 𝑠 superscript 𝑥 𝑠 1 {\displaystyle{\displaystyle e^{x}E_{1}\left(x\right)\sim\sum_{s=0}^{\infty}(-% 1)^{s}\frac{s!}{x^{s+1}},}}
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