
\subsection{\bf Parallel Issues in Calculation of Matrix Elements}
\begin{slide}
\begin{itemize}
\item Divide world up into geometric domains as usual (Figure~FEM~9)

\vspace{5pt}
\begin{center}
\centerline{\psfig{figure=cps615.fig9.ps,clip=true,width=4.5in}}
Figure: FEM 9
\end{center}

\item Information (triangles with $i,j$ as an edge) to calculate
$A_{ij}$ can involve $\geq 2$ processors (four is most in
two-dimensional example), but communication is local.

\item This is called assembly.

\item Each processor should know $A_{ii}$ and $A_{ij}$ for all $j$
connected to each $i$ ``owned'' by processor.
\end{itemize}
\end{slide}

