Comment #9 on issue 1525 by [email protected]: No integration by substitution
http://code.google.com/p/sympy/issues/detail?id=1525
I'm looking at this. First of all, the diff part is working for functions:
>>> f(2*x).diff(x)
2*D(f(_u), _u)
That's where the u is coming from. So the problem lies in risch, perhaps,
in that the wrong integral is being obtained. I don't think that the
differentiation behavior should be reverted.
--
You received this message because you are subscribed to the Google Groups
"sympy-issues" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sympy-issues?hl=en.
