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Draft: Hierarchical Lagrange basis with element bubble function

Simon Praetorius requested to merge feature/hierarchic-lagrange-bubble into master

Summary

Similar to the HierarchicalLagrangeBasis there is a hierarchical basis with element bubble functions implemented in dune-localfunctions. This MR makes this available to dune-functions and implements the Stokes problem with a combination of P2+B3 for the velocity and discontinuous P1 for the pressure.

Requirements

Edited by Simon Praetorius

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