#11143: define symbolic functions for exponential integrals
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Reporter: kcrisman | Owner:
benjaminfjones
Type: defect | Status:
needs_review
Priority: major | Milestone: sage-4.7.2
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 benjaminfjones):
@kcrisman - Yes, thanks, I just spotted that typo in the docstring for
`exp_integral_li` while I was commenting on the other tickets you cc'd me
on.
The function names are long. I wanted to choose a common prefix for all
the exponential integrals. I think burcin suggested `exp_integral`
originally. I think the problem with `li` and `Li`, or `En` and `Ei`,
etc.. is that the name is very short and not very informative unless you
are familiar with all the different varieties of standard exponential
integrals. Also, I think the short two-letter names would be easy to mix
up, especially `li` and `Li`. Yes, you're right, the difference between
those logarithmic integrals is the constant `\int_0^2 1/log(t) dt`.
I made some comments on #7357 and #3401. Basically, I think it makes sense
to roll the issues in those two tickets into this one since this one is an
overhaul of the exponential integral functions with the aim to make them
all symbolic and organize them in the same module.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11143#comment:32>
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