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yeh i know of terry pratchet(who is consistantly good in most cases), um Douglas Adams(but he starts to lack in the later half of the hitchhikers) some of his dirk gently books are good although I havent read all of em? Do you know of anyone else, Nick Hornby, um feck Im just interested if there...

This may sound stupid, but say in parametrics, when you have to prove that two vertical lines are parallel. Do u just say there two gradients are undefined?... mabye its just me, but it seems a bit wierd