Found A Mistake?

If you find a mistake in the book, first let me offer you my apologies.

Second, if you have the time, please drop me a line at russ at with the page number and a quick description of the problem. If you take the trouble to report the problem I will include it in the erratta page here and will fold it into the paper book at the first possible opportunity. I will also thank you by name, so make sure you spell you name right!