Definition:Exponential Integral Function/Also denoted as
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Exponential Integral Function: Also denoted as
The exponential integral function $\map \Ei x$ is also seen denoted $\map {Ei} x$.
Sources
- 1968: Murray R. Spiegel: Mathematical Handbook of Formulas and Tables ... (previous) ... (next): $\S 35$: Miscellaneous Special Functions: Exponential Integral $\ds \map {Ei} x = \int_x^\infty \frac {e^{-u} } u \rd u$