Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

[EX Q]: Very intuitive in explaining the basic concepts and the fundamental and widely used methods in continuous-time finance. No deep background in math is required to have a good grasp of this book. I believe it is intuition rather than fancy skills that is important to build up interest and passion for studying a hard topic such as continuous-time finance.
[EX A]: Positive

[EX Q]: Well another one of my first dvd purchases...I found this concert very poor...it did nothing for me... the sound quality was poor, The set on stage was quite good but lacked the final sparkle, Janet's performance was glitzy... but sadly something was missing...my advice is puchase Janet's later DVDS...
[EX A]: Negative

[EX Q]: I stongly dislike this book. There is too much meaninglessness to it. I can read seven pages for something that can be stated in one paragraph...it's awful. Only Webster would be able to read this and not use a dictionary. I have understood two chapters! I don't see why an English teacher would like this book because it is full of empty sentences! It is hard for one to read this book without his mind wandering. As I stated before, this is not my kind of book!
[EX A]:
Negative