I purchased this book as part of a summer math review before starting a PhD program. As mentioned in a couple of reviews above, this book does not contain actual problem sets. However, it does contain the most thorough and understandable explanations that I have seen to date.
Most math textbooks, including the ones I purchased to accompany MIT's OpenCourseWare, are inconsistent in their explanations. More often than not, the author will present a solution with little to no work, leaving the student to puzzle out how the author reached it (which can be especially difficult if the author simplified his equation differently or used methods that he considers "common knowledge"). Banner specifically sets out to counteract this approach, taking the extra space and time needed to elaborate on sample problem solutions and tie those solutions to methods covered elsewhere in the text. The result is an extremely readable, easy to follow guide to calculus. For good measure, Banner also throws in some nice tricks that students can use to tackle complex problems.
The lectures that accompany this book on the website are also very valuable, but I love this book in part because it requires no lectures to be understood. Banner does not punt on any topic in the book, unless he feels that the material is beyond the scope (and even then, there is a good deal of complementary explanation in the Appendices).
My only complaint is that my calculus studies will take me beyond the Lifesaver. If Banner ever wants to write a book that presents some Calculus II material that is useful for graduate study (partial derivatives, for instance) or Linear Algebra, I will happily buy it.
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