Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I thought this book was awful!

I am a retired EE professor, interested in learning something about general relativity in order to apply it to the foundations of electromagnetic field theory.Frankly, this book reads like a series of powerpoint slides in a presentation in support of a grant application.There is very little of rigor here. The basic concept of a tensor is given a very glossy treatment. "A tensor is a machine that accepts a vector here, and a one-form there, and grinds out---"I have no problem with colorful language, but these authors never really progress beyond that, treating their topic without any semblance of rigor in a mathematical sense.I felt that my dollars spent on this book were wasted.