Aaron S. Meurer wrote:
> Other classes will be different, but Integral is going to have a
> special structure whenever I finish the Risch Algorithm (because it
> can prove that integrals "can't be done").

But what I'm suggesting is that after doing a subs -- the thing that cause the 
problems for Ondrej in the relativity file -- the integral may new be doable. 
And we should probably have a flag that indicates that the user wants it done 
if possible. On the other hand...perhaps the relativity example is one where 
you set the integral up as unevaluated so you can change variables and then you 
do the subs and want it done automatically for you...but that goes against the 
unevaluated principle. So perhaps this is a non-issue.

If you want doit done then you have to tell sympy when to doit if you've set up 
an unevaluated integral.

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