Instruct: Classify Amazon reviews into positive or negative sentiment
Query: sloppy introduction to an interesting perspective on physics

At times, the authors can be exceedingly clear, but for the most part, they get bogged down with mathmatical conundrums which rarely trouble a physicist. The text is often slow and difficult to read, and worse than that, the text is riddled with errors. This is a shame because the differential form approach to physics is so elegant and powerful. The text should not be used as an introduction to the subject. After several revisions, the authors will hopefully mold the text into something worth using.