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[cleanup][handbook] update parallel section with new linear solver

Merged [cleanup][handbook] update parallel section with new linear solver
cleanup/handbook-parallel into master
Merged Katharina Heck requested to merge cleanup/handbook-parallel into master
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doc/handbook/6_parallel.tex
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@@ -44,10 +44,10 @@ solver backend include the respective header
Second, the linear solver must be switched to the AMG backend
\begin{lstlisting}[style=DumuxCode]
using LinearSolver = Dumux::AMGBackend<TypeTag>;
using LinearSolver = AMGBiCGSTABBackend<LinearSolverTraits<GridGeometry>>;
\end{lstlisting}
and the application must be recompiled. The parallel \texttt{Dumux::AMGBackend} instance has to be
and the application must be recompiled. The parallel \texttt{AMGBiCGSTABBackend} instance has to be
constructed with a \texttt{Dune::GridView} object and a mapper, in order to construct the
parallel index set needed for communication.