Acknowledgements

There are many people who have helped make this book what it is now. The authors are very grateful for the generous help and support of many
competent, clever, and creative colleagues.

First of all, we would like to acknowledge our Indiana library consortium PALNI and the Lilly Endowment for funding our revision efforts and helping us make this available to a wider audience. They found our reviewers, Cody Patterson and Jeremy Case, who had wonderful constructive feedback for us. They also found our copyeditor, Jonathan Poritz, who went beyond our expectations with his helpful advice. Our Butler Library liaison to PALNI was Cale Erwin. He has dedicated many hours to listening to our progress and provided wonderful support through this open publication process.

We’ve also had a great deal of assistance from our wonderful Mathematics community. Our colleagues William Johnston and Rebecca Wahl dared
to use even the roughest first versions with their students and gave us some very early feedback. Their support helped encourage us to continue
on this strange journey, and we are forever thankful to be working with peers like them. We also gratefully acknowledge Leanne Holder and Kelsey Walters from Rose Hulman Institute of Technology who used a later version with their students and shared feedback from them in the forms of unicorn drawings and also an excellently detailed errata list. We particularly thank William Foss, Audrey Mitchell, Josh Norris, and Grace Sheridan from their classes for all their helpful comments.

Lastly, we would like to thank all of our students who have used this text with us for their responses, critiques, and encouragement. In particular,
Rachel Burke and Troy Weigand who helped us immeasurably that first semester with the roughest of rough drafts and also helped our students
with review documents and sessions.