Formula:2946

Digital Library of Mathematical Functions ID 6.6.E1

${\displaystyle{\displaystyle\mathrm{Ei}\left(x\right)=\gamma+\ln x+\sum_{n=1}^{\infty}\frac{x^{n}}{n!\thinspace n},}}$

Constraint(s)

${\displaystyle{\displaystyle x>0}}$

Symbols List

• ${\displaystyle{\displaystyle\gamma}}$: Euler’s constant
• ${\displaystyle{\displaystyle\mathrm{Ei}\left(\NVar{x}\right)}}$:
• ${\displaystyle{\displaystyle!}}$:
• ${\displaystyle{\displaystyle\ln\NVar{z}}}$: principal branch of logarithm function
• ${\displaystyle{\displaystyle x}}$: real variable
• ${\displaystyle{\displaystyle n}}$: nonnegative integer
 

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