On Wed, Oct 17, 2012 at 5:49 PM, Robert Hansen <email@example.com>
How do you handle units? Like 12 miles or 14 hours?
That's a very good question. How does one handle units in general? What axioms does one use? If there are none, then Robert's earlier question about an exam is well-posed: "Is this mathematics?"
How do you show a rational function between polynomials, such that a student can see it and simplify it or factor it?