Book:Murray R. Spiegel/Mathematical Handbook of Formulas and Tables/Chapter 35/Exponential Integral

Exponential Integral $\displaystyle \map \Ei x = \int_x^\infty \frac {e^{-t} } t \rd t$

 * $35.7$: Characterization of Exponential Integral Function


 * $35.8$: Power Series Expansion for Exponential Integral Function plus Logarithm


 * $35.9$: Asymptotic Expansion for Exponential Integral Function


 * $35.10$: Limit to Infinity of Exponential Integral Function