Preface to the Fourth Edition

This edition contains the entire print content of the Third Edition, including a few corrections, for which I am grateful to users of the book. It has been augmented by the new Schaums.com website and corresponding app, which can be downloaded and accessed by following the instructions on the inside front cover of this edition. Purchasers of the book are entitled to free access to the video and audio files which are available there.

Any further errors that users spot would be gratefully received at fsafier@ccsf.edu.

Fred Safier