Instruct: Classify a review into positive or negative sentiment.
Query: Not good book!

The book is not good in my opinion. The font size of writing is small and quality of pictures is not good. Sometimes, it is not easy to understand about what the author is talking. Some english sentences of the author are not gramatically correct and hence it makes difficult to understand the material. The steps in profs of theorems and lemmas are skipped. In summary, I do not suggest anybody to buy this book. Try other books on this subject.