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Title: Not for an Idle Read
Review: This book is a tough read. For starters, there is the subject matter. If you have had a traditional undergraduate training in mathematics, then talking about sets and elements with axioms that deal with functions rather than elements is a stretch. Then, there is the authors' presentation which mixes axiomatic category theory and naive set theory. The approach does motivate category theory with set theory and it does explain how set theory might be replaced with category theory but, as written, it also leaves the reader unsure which mode of thinking is required at any particular moment. This uncertainty is not likely to be fully resolved without a teacher or a second reading. You need one or the other to navigate some early chapters with knowledge gained later.
