Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Strang is lazy

In the preface, Strang complains that linear algebra has been taught too abstractly. After reading this book, I realize he was just finding excuses to slack off and avoid rigor. This book is written for you average kindergartner. I was shocked by lack of rigor and complete disregard for accepted mathematical methods. Strang treats linear algebra like a literature class, and lazily strolls through it avoiding all difficult proofs, theorems, and concepts. He can probably explain some of the material half-decently so you can understand the basic idea, but this text doesn't deserve to be called a math book--it's disgusting.Buy one of the other textbooks suggested by others, or just about any other linear algebra book. All others I've seen make attempts to be as rigorous as possible. Strang only makes excuses about his lack of teaching talent and complete laziness.