I would like to thank the many people who supported me as my class notes became a book.
First, my thanks to my DePaul colleagues Allan Berele and Stefan Catoiu for teaching from
preliminary drafts and to Susanna Epp and Lynn Narasimhan for encouraging me to take on
this project. Second, I thank Ken Price of the University of Wisconsin-Oshkosh for providing
useful feedback after using a preliminary draft.

Third, my thanks to Glenn Olson of Maine
East High School for providing me with information about the connection between complex
numbers and electrical circuits.

I owe a debt of gratitude to Dan Tripamer of St. Viator High School for all his work producing
the diagrams. Lauren Schultz Yuhasz of Elsevier has been enormously helpful, and the
comments by the reviewers she found helped shape the final product. My thanks to Phil
Bugeau of Elsevier for his help in the final stages of this project.

I would also like to thank the
University Research Council at DePaul University for their support.
Finally, a special thank you to my wife Donna and children Renee, Sabrina, Mark, and Melisa
for their continuous love and support.