Dear friends Here is another lecture on the same theme, this has been at the GIFRIC group in San Francisco http://youtu.be/ElIyWiYa8YY or at http://topologos.lutecium.org/wpmu/2014/03/26/982/ All the best Jacques -- Jacques B. Siboni mailto:jacsib at Lutecium.org 8 pass. Charles Albert, F75018 Paris, France Tel: +33 142 287 678 Fax: +33 951 720 069 Tel USA: (510) 219-3135 Home Page: http://jacsib.lutecium.org/ Lutecium pages: http://www.lutecium.org http://www.topologos.org