Acknowledgements

I want to thank Cathy D'Ambrosia for converting my handwritten version of these notes into L^ATEX. I also thank Joe Buhler, Albyn Jones, David Perkinson Rao Potluri, Joe Roberts and Jerry Shurman for many discussions about Math 112, and for helpful comments on earlier drafts of these notes. I thank Kelsey Alford-Jones for pointing out numerous typographical errors in an earlier draft of these notes, and I thank Jim Fix for his advice on how to turn these notes from L^ATEX to HTML.