li( z )
The logarithmic integral of z in SageMath. Alias of log_integral. Defined by
\[ \operatorname{li} (z) = \int_0^z \frac{ dt }{ \ln(t) } \]Relation to the exponential integral Ei:
\[ \operatorname{li} (z) = \operatorname{Ei} ( \ln(z) ) \]Plot on the real axis:
Series expansion about the origin:
Special values:
Related functions: log_integral Ei
Function category: exponential integrals sagemath-docs