@f{eqnarray*}
\tau = \frac{\kappa}{\ell} + |\mathbf{c} \cdot \mathbf{n}|
@f}
-where we set the diffusion length scale to $\ell = \frac{1}{5}$.
+where we set the diffusion $\kappa=1$ and the diffusion length scale to
+$\ell = \frac{1}{5}$.
The trace/skeleton variables in HDG methods are single-valued on element
faces. As such, they must strongly represent the Dirichlet data on
&=& 0,
\quad \forall \mathbf{v} \in \mathcal{V}_h^p,
\\
- (w, \mathbf{c}\nabla u_h + \nabla \cdot \mathbf{q}_h)_{\mathcal{T}}
+ - (\nabla w, \mathbf{c} u_h)_{\mathcal{T}}
+ + \nabla \cdot \mathbf{q}_h)_{\mathcal{T}}
+ \left<w, \tau (u_h - \hat{u}_h)\right>_{\partial \mathcal{T}}
&=&
(w, f)_{\mathcal{T}},
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