Larger experiments ....\\
-Describe the problems ex15 and ex54
+In the following we describe the applications of PETSc we have experimented. Those applications are available in the ksp part which is suited for scalable linear equations solvers:
+\begin{itemize}
+\item ex15 is an example which solves in parallel a 2D homogeneous
+ Laplacian. Thediagonal is equals to 4 and 4 extra-diagonals representing the
+ neighbors in each directions is equal to -1. This example is used in many
+ physical phenomena , for exemple, heat and fluid flow, wave propagation...
+\item
+\end{itemize}
+
+
+
+
\begin{table*}
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