All the contents of this site are at the disposal
of my colleagues teaching at any school or university. You are permitted to
copy the HTML texts, multimedia and the applets for non-commercial purposes.
You are also allowed to put these contents on the internet provided that you
don't remove the copyright remarks and the original URLs. However, any
commercial use is strongly prohibited without previous agreement with the
author of this site. The right of commercial use remains at the
author.
