\section{Why another calculus book?}
(FIXME: I swear I have this written elsewhere)
Basically, I wanted to understand and organize the material I was teaching
(and that I presumably had once learned).

The intended audience is:
- mathematicians -- a reference work (rather than a teaching text)
- teachers -- teaching calculus, written so that you can understand it,
  rather than having the insane bulk of introductory texts.

The level of sophistication varies dramatically; you don't need to understand
everything for it to be useful.

It is -not- aimed at new students, even bright ones, as it doesn't include the
background necessary to understand it. Indeed, to fill in the details would
take much of an undergraduate education in math.
However, it should be a great sourcebook for teaching such students.
(on the model of math 25/55 at Harvard, or Honors Analysis at UChicago)

Goals:
\begin{description}
\item[Mastery of material]
  Deep and varied understanding (more than would be reasonable for a student
  to learn on first reading).
\item[Hooks/extensions]
  Point out where one can extend and go deeper, say in a more
  advanced/abstract class.
\end{description}
