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Integration of (d-1)-dimensional functions on finite element surfaces

should I enforce a mapping in global coordinates or reference coordinates? Yes, it is important to make sure you have a consistent mapping since when you want to compute $f^*_h(u^+, u^-)$ you need to ...
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Gradient jump in DG weak formulation

Let $\Omega = \Omega_1 \cup \Omega_2$, where $\{ \Omega_i \}$ represents two elements that share an interface $\Gamma = \Omega_1 \cap \Omega_2$. Assume that $u \in H^2(\Omega)$. Multiplying $\Delta u$ ...
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