Comment #11 on issue 2571 by asmeurer: Regression in Integral.subs http://code.google.com/p/sympy/issues/detail?id=2571
OK, to be clear, I agree that we should not replace integration/differentiation variables with subs (or anything else where only a Symbol make sense).
I'm not sure if subs() currently satisfies this, but it may if old is a Symbol.
Probably not because it will have varying luck replacing things depending on the structure of the expression.
This discussion is all very related to my discussion on the mailing list on how to extend subs to be able to turn on and off different rules.
-- You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to sympy-issues@googlegroups.com. To unsubscribe from this group, send email to sympy-issues+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy-issues?hl=en.
