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DG on Surfaces

Alexandru Fikl requested to merge surface-operators into master

This adds all the building blocks needed to do DG on surfaces. The main pieces are:

  • WADG for an efficient mass inverse.
  • Surface normals and derivatives as described e.g. here.

Some remaining TODOs

  • This is waiting for some proper per discretization group WADG
  • Would be nice to have an example advection on a circle or something like that
  • A lot of the differential geometry is wholesale copied from pytential (for better or worse).
Edited by Andreas Klöckner

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