Thanks to Richard Fateman for spreading the news. May Bill rest in peace. Pedro Fortuny. Too impressed to say anything else. -- Pedro Fortuny Ayuso --------> www.geocities.com/pedro_fortuny School of Mathematical Sciences. Queen Mary & Westfield College. Mile End Road, London E1 4NS, UK ------> www.qmw.ac.uk Tfn. Nr. 44 20 7882 5440