Dear all,

As indicated in the documentation 
<http://dealii.org/developer/doxygen/deal.II/classFE__DGP.html>, the finite 
elements FE_DGP and FE_FaceP are not based on nodal interpolation (as eg. 
FE_DGQ and FE_FaceQ), but on projection. Apparently, this prevents these 
elements from being used in combination with a hp::DoFHandler, since there 
seems to be no easy way (or even no way?) to implement the functions 
hp_*_identities for FE_FaceP (which is needed to support hp) when no nodal 
interpolation (ie. no unit_support_points) is available.

I would really like to use the FE_DGP/FE_FaceP combination in a hp FEM 
computation, as this requires fewer DoFs than the FE_DGQ/FE_FaceQ couple.

Does anyone have an idea how to fix this problem? I imagine that either:
- one could implement hp_*_identities, somehow, based on the existing code 
with projection, or
- one could implement a different version of FE_FaceP with nodal 
interpolation
but i don't really know whether these approaches could work and where to 
start.

Best,
Samuel

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