#11143: define symbolic functions for exponential integrals
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Reporter: kcrisman | Owner:
benjaminfjones
Type: defect | Status:
positive_review
Priority: major | Milestone:
sage-5.3
Component: symbolics | Resolution:
Keywords: ei Ei special function maxima sd32 sd40.5 | Work issues:
Report Upstream: N/A | Reviewers:
Burcin Erocal, Karl-Dieter Crisman, William Stein
Authors: Benjamin Jones, Volker Braun | Merged in:
Dependencies: #13109 | Stopgaps:
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Comment (by kcrisman):
Hey Ben, question. Which `Li/li` is Maxima using with its conversion? I
think that `expintegral_li` actually correspond to `Li` (#3401), not the
`li` provided here, though the integral of `log_integral` does seem
right... Also, while looking at this I noticed that
{{{
\operatorname{li}(x) = \int_0^z \frac{dt}{\ln(t)} =
\operatorname{Ei}(\ln(x))
}}}
probably should have a `x` not a `z` in the integral bound.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11143#comment:85>
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