\subsubsection{Using simplex meshes}
-After having created a triangulation, one can proceed in the same way
-as for hypercube meshes. In particular, one selects an appropriate finite element, mapping, and
+After creating a triangulation, one can proceed in the same way as for hypercube
+meshes. In particular, one selects an appropriate finite element, mapping, and
quadrature class as follows:
\begin{c++}
FEValues<dim, spacedim> fe_values(mapping, fe, quad, flags);
\end{c++}
-The list of currently supported finite-element classes is provided in Table~\ref{tab:simplex:fe}. Currently,
+The list of currently supported finite element classes is provided in Table~\ref{tab:simplex:fe}. Currently,
only linear and quadratic mappings via the \texttt{MappingFE} and
\texttt{MappingFEField} classes built around the listed nodal elements are available.
%\todo[inline]{I don't understand the previous sentence. "linear" means
\subsubsection{Using mixed meshes}
For mixed meshes, concepts known from the $hp$-context have been applied:
- different finite-element classes are assigned to different cells
+ different finite element classes are assigned to different cells
based on their respective kind of reference cell. In the
case of a 2D mixed mesh, which can only consist of triangles and
quadrilaterals, the finite element defined on a triangle (e.g., \texttt{FE\_SimplexP})
a mesh of lower dimension. Determining to which \texttt{cell} a quadrature
point belongs to on the background mesh, including the reference cell
coordinates \texttt{reference\_\allowbreak points}, is aided by functions like
-\texttt{find\_active\_cell\_around\_point()}
-\texttt{find\_all\_active\_cells\_\allowbreak around\_\allowbreak point()} from the \texttt{GridTools} namespace. While these
+\texttt{find\_active\_cell\_around\_point()} and
+\texttt{find\_all\_active\_\allowbreak cells\_\allowbreak around\_\allowbreak point()} from the \texttt{GridTools} namespace. While these
functions have been available in \dealii{} previously, their performance has
been considerably enhanced with the aforementioned more optimized code paths
for selected mappings.