[BillChen]

I'd like to thank everyone for catching our errors. I have to say that we didn't expect the book to be error-free. We read over it several times along with our editors and reviewers, but at some point you have to decide to release the book. During the editing phase we made sure the sections were as understandable to our outside readers as possible, and I hope our efforts paid off there. I don't mind saying most of the clearly written prose is Jerrod's and any typos in the equations are likely to be mine:-).

Bill Chen