
\subsection{\bf The Red-Black Two Phase Parallel}
\subsection{\bf Gauss Seidel Iteration}

\begin{slide}
\centerline{\psfig{figure=918_11.ps,clip=true,width=3.5in}}

\begin{center}
Red $\odot$ \hspace{3em} Black $\bullet$
\end{center}

\begin{itemize}
\item Note calculation of $\odot$ only depends on $\bullet$ points and
vice versa

\item So two phase algorithm.  

Calculate all $\odot$---Phase I.  

Then all $\bullet$---Phase II.
\end{itemize}

\end{slide}

