Comment #1 on issue 3901 by [email protected]: Improve integration of li(z)
http://code.google.com/p/sympy/issues/detail?id=3901
I think dealing with integrands containing li is much simpler than dealing
with ones that would produce li (the same with erf, or other functions
defined by nonelementary integrals). In fact, the algorithms that are there
may already be able to do it, but just not with enough rigor to determine
if a nonresult means it is nonelementary (in the li extension).
We really ought to just rewrite risch to deal with nontranscendental
extensions. I think the only difference is that we cannot assert
nonelementaryness in that case, but it is not a big deal (vs. getting many
more integrals for free). One does need to verify the theory to be sure of
this, I think it is the case.
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