pdf isn't, it seems, good enough for mathematicians. at least for one of them in this university ;-) in a thread about putting maths on the web (in an internal newsgroup) i've today been told that "converting whole documents to pdf is entirely the wrong idea". the imaging model is fine; there are those who don't think the hypertextual model is good enough, it seems. who am i to gainsay them? (i haven't been a `mathematician' since 1967, so i hardly count...) robin