This monograph is a companion to the online edition of my textbook "Elementary Calculus: An Approach Using Infinitesimals". It can be used as a quick introduction to the infinitesimal approach to calculus for mathematicians, as background material for instructors, or as a text for an undergraduate seminar.

The first edition of this monograph was published in 1976, as a companion of the first edition of Elementary Calculus, by Prindle, Weber & Schmidt. The first edition is now out of print and the copyright has been returned to me as the author.

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.