Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Titled improperly

NOTE:The two books I make reference to here were purchased from Amazon.I recently bought 'Advanced Calculus' to replace one that I lost which was superior to this recently purchased Advanced Calculus book. The first chapter of this book was about 'sets'. I returned because if I wanted to read about sets I would have bought one about sets.Now about the 'Group Theory' book. A much BIGGER disappointment. Since Group Theory is based on sets it would have been very appropriate for this book to cover Sets first. No, instead it starts immediately with set concepts on the very first page as if this was a continuation of a lecture on Advance Group Theory from the day before. I'm still looking for a Group Theory book that starts at the beginning. Don't buy this book unless you were 'present in the lecture the day before'