(Copyright 2009 by Jerry Shurman. Any part of the material protected by this copyright notice may be reproduced in any form for any purpose without the permission of the copyright owner, but only the reasonable costs of reproduction may be charged. Reproduction for profit is prohibited.)

Wiley has returned the copyright of the book to me, and the book is posted here as pdf for anyone who wants it. The typesetting isn't all that it should be, and there is at least one nontrivial error in the book, but I am leaving things as they are.

Comments and corrections should be sent to jerry@reed.edu.