Implementation of a residual error estimator for the Poisson problem - a lifting technique

In this example we want to show how one can easily implement an error estimator for the Poisson problem \( - \Delta u = f )\ given by $\eta(u_h)^2 := \sum\limits_{T \in \mathcal{T}} h_T^2 \| f + \Delta u_h\|_{L^2(T)}^2 + \sum\limits_{E \in \mathcal{F}} h_E \| [ \! [ \nabla u_h \cdot n ] \! ] \|_{L^2(E)}^2.$

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