> So from your second paragraph, I'm not even sure if I can do the
> following (which is different than the situation i posed below) - I
> solve a system of 2 equations (for u and v) and I use an FESystem:
>
> FESystem<2> fe_vel (FE_Q<2>(1), 2);
>
> And now i want to use that as a member of a collection :
>
> hp::FECollection col;
> col.push_back (FESystem<2>  (FE_Q<2>(1), 2));
> col.push_back ([something else]);
>
> ... can i not do this either???

You can. You can think of a FECollection as similar to 
  std::set<FiniteElement*>
if you want. You can push anything that's derived from FiniteElement into the 
collection, but you can't have a FESystem where one of the components is a 
FECollection because FECollection is not derived from FiniteElement.

Best
 W.

-------------------------------------------------------------------------
Wolfgang Bangerth                email:            [email protected]
                                 www: http://www.math.tamu.edu/~bangerth/

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