Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very difficult to learn from this book

The bad: This book is atrocious. Definitions are ambiguous and use meaningless phrases like "when order matters". The concepts are very poorly explained. And the examples, though plentiful, are either trivial or poorly explained. The problems at the end of the chapter require theorems not presented in the text. Finally, the cost of this book is incredibly high.The good: There are lots of interesting problems in the book.