**Acknowledgments**

The authors are extremely grateful to the referees for their many helpful suggestions and corrections.**About the Authors**

Rob Bradley is a professor in the department of mathematics and computer science at Adelphi University. With Ed Sandifer, he wrote *Cauchy's Cours d'analyse: An Annotated Translation* and edited *Leonhard Euler: Life, Work and Legacy.* He is chairman of HOM SIGMAA (the History of Mathematics Special Interest Group of the MAA) and past-president of CSHPM (the Canadian Society for History and Philosophy of Mathematics).

Salvatore J. Petrilli, Jr. is an assistant professor at Adelphi University. He has a B.S. in mathematics from Adelphi University and an M.A. in mathematics from Hofstra University. He received an Ed.D. in mathematics education from Teachers College, Columbia University, where his advisor was J. Philip Smith. His research interests include history of mathematics and mathematics education.