exp_integral_ei( z )
The exponential integral Ei of z in SageMath. Alias of Ei. Defined by
\[ \operatorname{Ei} (z) = \int_{-\infty}^z du \: \frac{ e^u }{ u } \]Relation to exp_integral_e1 for x > 0 :
\[ \operatorname{Ei} (-x) = - E_1 (x) \]Plot on the real axis:
Series expansion about root:
Special values:
Related functions: Ei exp_integral_e1 exp_integral_e
Function category: exponential integrals sagemath-docs