Calculus

A good book, esp. for new learners. The author tried to invoke intuition all the time by treating the subject in issue in an unformal way. Simply examples are called upon to show the motivations. Strict definition and proof are given later to make the text complete. This is exactly what I would need if I were studying calculus for the first time. Overall, The writing is clear and consistent, thus make it a good textbook for both classroom use and self-study purpose. However, given the approach the author used, this book is not suitable for quick reference for those who have already learned the subject and just wish to revive the knowledge.