Plot derivative of a function

[jte]

(06-08-2014 01:00 PM)parisse Wrote:  Maths notations are most of the time context-sensitive…

This discussion reminds me of a math class I attended many years ago. I can't recall the exact subject at the moment (it might have been a measure theory course). The hour-long class consisted of discussing a single proof. It wasn't until the last few minutes of the class that we suddenly realized we were using the same letter for two distinct meanings (using it, in each meaning, perhaps a half-dozen to a dozen times). There was no confusion as to which meaning was intended in each case. We had a good laugh when we realized what had happened. The professor attempted to rewrite the instances still remaining on the blackboards, but didn't have time (and the attempt ended up making what was written more confusing).