He was teaching us the basics of calculus (advanced math class). It was the discussion of limits (from 30y/o memory) that made me think about it - in fact it may have been exactly that statement about the larger the denominator, the closer to zero.
He got a bit annoyed when he couldn’t explain it - I got dumped back to regular maths class for a couple of weeks. He probably just couldn’t think of the answer on the spur of the moment and I sure as hell wasn’t going to ask again - regular maths was bloody boring.
Lemur866 explained it with a wonderful simplicity that I understand completely. Every other explanation has clarified it or been so completely beyond my rusty skills it’s liable to confuse me all over again.
Thanks, ignorance fought as much as I can handle.