\begin{exampleblock}{}
\begin{itemize}
\only<1>{\item Parallel iterations: convergence
\begin{center}
\includegraphics[width=8cm]{../implementation/para_iterate_dec.ps}
\end{center}}
\only<2>{\item Chaotic iterations: divergence with $J^t=\{24;15;14;15;\ldots\}$
\begin{center}
\includegraphics[width=4cm]{../chao_iterate_excerpt.ps}
\end{center}}
\only<3>{\item Asynchronous iterations: divergence even with $J^t=I$  
\begin{itemize}
\item $S^t = \left(
\begin{array}{lllll}
t & t' & t & t & t \\
t & t & t & t & t \\
t & t & t & t & t \\
t & t & t & t & t\\
t & t & t & t & t \\
\end{array}
\right)
\textrm{ where }
t' = \left\{
\begin{array}{l}
t \textrm{ if t is even;} \\
t-1  \textrm{ otherwise.}
\end{array}
\right.
$
\item 
$
\begin{array}{rcl}
X^{2k+1} & =& F(X^{2k}) \\
X^{2k} & =& \left(
\begin{array}{l}
F_1(X_1^{2k-1},X_2^{2k-2},X_3^{2k-1},X_4^{2k-1},X_5^{2k-1}) \\
F_2(X^{2k-1})\\
\vdots \\
F_5(X^{2k-1})
\end{array}
\right).
\end{array}
$

$\rightarrow$ cycle between 3 and 11.
\end{itemize}
}
\end{itemize}
\end{exampleblock}