Date: Nov 11, 2012 8:58 PM
Author: Robert Hansen
Subject: Re: How teaching factors rather than multiplicand & multiplier confuses kids!

On Nov 11, 2012, at 10:49 AM, Robert Hansen <> wrote:

> What you are trying to say is that a function whose graph can be traced without lifting the pencil is a common sense "interpretation" of continuity. But by itself it is not an interpretation of anything. It is only a damn good interpretation to you and I because we already understand continuity. To a student that is just starting the journey, it is nothing but an example of what we are about to delve into.

To put a point on all of this. Our common sense interpretation of common sense is wrong, as is often the case with common sense.

Bob Hansen