As a graduate student who had to buy and use this book for a class, I strongly discourage using this book for teaching or for beginners to fuzzy logic. The problems created from the errors in problems and theorms causes more difficulty than working the actual problems.I would have given this book two stars, except for the fact that there are not nearly enough examples to complement the theorms. Neglecting examples and leaving the reader with just a long algorithm (which may or may not have typos) is fine for a reference, but not for a book that presents these concepts to the novice.I consider this book $95 not well spent.