-- Programming languages teach you not to want what they cannot provide. You have to think in a language to write programs in it, and it's hard to want something you can't describe. Paul Graham, ANSI Common Lisp. -- Christophe Pouzat MAP5 - Mathématiques Appliquées à Paris 5 CNRS UMR 8145 45, rue des Saints-Pères 75006 PARIS France tel: +33183945882 mobile: +33662941034 web: http://xtof.disque.math.cnrs.fr/