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Title: A Good Book on a Hard Subject
Review: Being an introduction to so many branches of mathematics and still self contained in the development of a specific theory, I think this book is a must for anyone who wants to get at least a glimpse of what lies beyond the curtains of real mathematics. I studied the book as an undergraduate, and the subject was hard to me, which made it all the more fun. I have pursued my graduate work in physics and although not directly helpful yet, the introduction to commutative diagrams, homological algebra, the abstract approach to products and coproducts and many other advanced subjects of mathematics has really been a wonderful intellectual challenge.
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