#11143: define symbolic functions for exponential integrals
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Reporter: kcrisman | Owner:
benjaminfjones
Type: defect | Status:
needs_review
Priority: major | Milestone: sage-5.0
Component: symbolics | Keywords: ei Ei
special function maxima sd32
Work_issues: | Upstream: N/A
Reviewer: Burcin Erocal, Karl-Dieter Crisman | Author: Benjamin
Jones
Merged: | Dependencies: #11513,
#11885
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Comment(by kcrisman):
> Since all the dependencies have been merged I thought I would rebase
this ticket and make the outstanding changes from the last comment. I've
changed the names of the functions in the new module
`sage/functions/exp_integral.py` according to my proposal in comment
[comment:36] and added top-level aliases `li, si, ci, shi, chi`.
This came up while preparing for a Sage talk today - I tried
{{{
sage: integrate(log(x-1)*e^x,x)
e*expintegral_e(1, -x + 1) + e^x*log(x - 1)
}}}
and of course it doesn't LaTeX very nicely.
I'll try to look at this soon. I already know that we would need to make
`si` into `Si`, etc., because that ''is'' the standard notation (first
letter capitalized, see all the references above), but I can make a
reviewer patch which does this. But it sounds like this should be finally
ready to go. Sorry for the long process here!
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11143#comment:38>
Sage <http://www.sagemath.org>
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