“This is the perfect solid-as-they-come, timeless book on the calculus, and most likely it will never be surpassed in this domain.” –Amazon Review

This book is intended for anyone who, having passed through an ordinary course of school mathematics, wishes to apply himself to the study of mathematics or its applications to science and engineering, no matter whether he is a student of a university or technical college, a teacher, or an engineer. Courant leads the way straight to useful knowledge, and aims at making the subject easier to grasp, not only by giving proofs step by step, but also by throwing light on the interconnections and purposes of the whole.