"Ferreirós presents a new fusion of philosophical and mathematical ideas that is thought provoking and original. This book is obviously the product of great and conscientious scholarship."--John Stillwell, University of San Francisco
"Ferreirós addresses the philosophy of mathematics from an important and original perspective. He engages with many fascinating topics in the history of mathematics along the way, and his book is exceptionally well documented with references to the secondary literature."--Jamie Tappenden, University of Michigan