Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Poor Text, Poor Reference

The only thing that comes through cleary in this book is the author's arrogance. The reader will get a very good sense that Lang understands the material, but the reader will also get the sense that there must be a better book out there. Even as a reference, this book is lacking. The index is incomplete, and many important concepts are either poorly defined or the relevant equivalent definitions are not given. Finally, the order in which the material is presented is haphazard at best. This is truly a text only for those with a Ph.D. who work primarily in the field of Algebra.