Rendered by the New Chatterbox XML Ticker Fairy nuff. I'd have thought Categorised Q&A would be the place for it. /me browses the [Q&A] section [id:\\293402] seems to cover it. [id://293402] this is close, but for the search terms :-) heh :-) Bleep it, I never did speak HTML. Let's see if this link works: [id://293402] /me had this in a CS/Math departments crossover course. I was surprised at the difficulty some in the class had grasping that FP is an approximation.