Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Poor formatting and full of errors

This is not a review on the content but on the presentation of this ebook. It is full of formatting errors. Even worse, mathematical formulas are wrong in places due to incorrect formatting. Obviously this ebook must have been produced using an automated process with no proof reading. This is utterly unacceptable, especially considering that the ebook costs almost as much as the print version. Verdict: useless.