I refer to the part where the spatial residual is defined as B(w_n)(z)=...
There you integrate over G(w_n), z over \partial\Omega, but I would have 
expected to integrate over \Omega. I have not compared that equation with 
the code yet, after I already had problems with that step.

Am Mittwoch, 16. August 2017 15:38:44 UTC+2 schrieb Wolfgang Bangerth:
>
> On 08/15/2017 01:15 AM, 'Maxi Miller' via deal.II User Group wrote: 
> > I try to follow the math in example 33, but am not fully able to 
> understand 
> > how the right hand side is included. According to my understanding, I 
> have the 
> > function/vector G, multiply it with the test function z, and integrate 
> over 
> > both over the whole area. After there are no derivatives included, I do 
> not 
> > have to do any reformulations. Why do I then still end up with an 
> integral 
> > over both (G\cdot z), but integrated over the border? 
>
> Can you point out where in the code this happens? 
>
> There is of course a boundary term that comes from integrating by parts 
> the 
> equation. But G itself should not appear in a boundary integral. 
>
> Best 
>   W. 
>
> -- 
> ------------------------------------------------------------------------ 
> Wolfgang Bangerth          email:                 bang...@colostate.edu 
> <javascript:> 
>                             www: http://www.math.colostate.edu/~bangerth/ 
>
>

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