This book is a study of the controversy surrounding the invention of the differential calculus. It focuses on the claim of the German philosopher and mathematician Gottfried Wilhelm Leibniz, who maintained that he had invented the calculus independently of Sir Isaac Newton. The book discusses the historical and philosophical aspects of the dispute, and offers a critical evaluation of the evidence supporting Leibniz's claim. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.