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In taking a course from this book, I found that it is not really suitable for study. Its treatment of calculus on manifolds is too quick and not rigorous enough to really be helpful to a student who is seeing this material for the first time (the supposed target audience). His proofs often contain errors or omissions (not major, but annoying when learning), and his definitions are hidden in the text, marked only by boldface font. This makes the book infuriating to read, since once the defined term has been found, it can require some effort to track down the actual definition, which can even be on a separate page! Finally, his exercises are generally quite awful. They focus on computations which rarely shed much light on the book's material or on the exercise. One such problem is titled "A First Course in Complex Analysis," and uses differential forms to derive the Cauchy integral formula. While cute, this did not reinforce strength in forms or complex analysis--it was simply a tedious set of computations.
There are many other books on differential geometry out there, and a reader can do much better than this one. Many of his definitions are very imprecise, particularly when he comes to differential forms, which are probably one of the most unfamiliar parts of his books to the average undergraduate. Also, he does very little to indicate how further study might proceed. While he mentions closed and exact forms, he never mentions how these notions can be used to study the geometry of a space (de Rham cohomology). He defines chains and integration of forms on chains, and even proves Stokes's theorem, but he does not mention the important dual relation of chains and forms (singular homology). Finally, his speed and quick prose forces the reader to work much harder than he or she should, thereby "inflating" the required prerequisites he tries to keep so low.
Before buying this book, I suggest you try reading one or two pages (excluding Chapter 1) on the stuff that you think you are best familiar with. If you can understand every paragraph within 30 minutes without having to go back and forth, you must have been a grad student in math for 3 years and about to get a Ph.D. in analysis. I'm not kidding!
Having said the above, I think this is a wonderful little book. Its notations are the best I have seen. No confusions at all, at least not for me. People also do refer to this book a lot.
One thing I find quite bothersome is the treatment of measure zero. I think Spivak spent too few pages on it. Well, speaking about spending too few pages, if you see a proof going for more than two pages in this book, be prepared. Take a bath, eat a good dinner and sit tight before going through it. :) Almost forgot: you ABSOLUTELY need to do the exercises.
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