Having inferiority complexity, I always want to understand lots of mathematics better, especially on Calculus.  I bought several books on this topic, but because of short of my free time to study, I couldn't advanced in my calculus skill.  In my country, basic calculus is for high-school students.  It has some merits compared to other countries whose students learn the calculus on their college life, but has a serious defect; making the student lose the interest to mathematics due to the scoring policy.  Thus, I know how to solve/simplify complex equation, how to solve differentiation, and so on, but never fully understood the meaning of them.<br><br>Reading this book (I admit, that I just finished to read Chapter 7), brought me the enlightenment of the differentiation and integration, especially the concept of calculus, not just how to solve them.  I know other great books on calculus especially for the students.  However, being a person who has limited time to study, this book shines above all. (Even for non-English speakers like me.)<br><br>There is one minor defect I think,  like many mathematics books, it refers to other section and figures in a different pages a lot.  Thus it prevent me from reading smoothly sometimes.  Most of equations are rendered as images with reasonable size and resolution, so it does not cause problems, although they look somewhat ugly.