fixed folders

examples/scipy/README.md

@@ -16,4 +16,4 @@ This script focus on the Jacobi matrix of the advection operator:
 f(u) = c_x \frac{\partial u}{\partial x}
 ```
 
-It compute it in 1D, 2D, 3D, and extract the eigenvalues for each cases.
\ No newline at end of file
+It compute it in 1D, 2D, 3D, and extract the eigenvalues for each cases.

examples/sympy/README.md

+# Sympy examples
+
+This directory contains several script that show how sympy can be used for particular scientific applications.
+Also, you can look at an [extended list of Sympy Tutorials](http://docs.sympy.org/latest/tutorial/index.html) to go further ...
+
+## [solve-diff-eqns.py](solve-diff-eqns.py)
+
+This script is a basic example of how to solve a differential equation using sympy.
+
+In particular, the equation u''(t) - u(t) = exp(t) is solved, using the sympy function dsolve [minimize](http://docs.sympy.org/latest/modules/solvers/ode.html).