Formula:2914

Digital Library of Mathematical Functions ID 6.2.E6

${\displaystyle{\displaystyle\mathrm{Ei}\left(-x\right)=-\int_{x}^{\infty}\frac{e^{-t}}{t}\mathrm{d}t=-E_{1}\left(x\right),}}$

Symbols List

• ${\displaystyle{\displaystyle\mathrm{d}\NVar{x}}}$: differential of x
• ${\displaystyle{\displaystyle\mathrm{e}}}$: base of natural logarithm
• ${\displaystyle{\displaystyle E_{1}\left(\NVar{z}\right)}}$: exponential integral
• ${\displaystyle{\displaystyle\mathrm{Ei}\left(\NVar{x}\right)}}$:
• ${\displaystyle{\displaystyle\int}}$: integral
• ${\displaystyle{\displaystyle x}}$: real variable
 

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