Formula:2939

Digital Library of Mathematical Functions ID 6.5.E1

${\displaystyle{\displaystyle E_{1}\left(-x\pm i0\right)=-\mathrm{Ei}\left(x\right)\mp i\pi,}}$

Symbols List

• ${\displaystyle{\displaystyle\pi}}$: the ratio of the circumference of a circle to its diameter
• ${\displaystyle{\displaystyle E_{1}\left(\NVar{z}\right)}}$: exponential integral
• ${\displaystyle{\displaystyle\mathrm{Ei}\left(\NVar{x}\right)}}$:
• ${\displaystyle{\displaystyle\mathrm{i}}}$: imaginary unit
• ${\displaystyle{\displaystyle x}}$: real variable
 

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