OK. I just wanted to be sure.  Sometimes there is strange behavior in  
SymPy that turns out to actually be intentional.  This is now issue  
1604.

Aaron Meurer
On Aug 15, 2009, at 8:25 PM, Ondrej Certik wrote:

>
> On Sat, Aug 15, 2009 at 8:17 PM, Aaron S. Meurer<asmeu...@gmail.com>  
> wrote:
>>
>>  >>> integrate(exp(x)*g(x), x)
>> exp(x)*g(x) - D(g(x), x)*exp(x)
>>
>> Can someone tell me, is this a bug?  If this is intentional, can
>> someone please explain why?  If I remember my integration by parts
>> correctly, that second term should be Integral(D(g(x), x)*exp(x), x),
>> though really it should just be returning Integral(exp(x)*g(x), x) in
>> this case.  Otherwise you could expand like this infinitely and never
>> get a result.
>
> Yes, it's a bug, thanks for discovering it. Please create an issue  
> for it.
>
> Ondrej
>
> >


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