Title: Great Book!
Review: Gray does not intend for you to buy his book if you don't haveaccess to Mathematica and simply want to learn about differentialgeometry from an axiomatic standpoint. Of course if you don't have access to Mathematica, this isn't for you, and even if you do have Mathematica, you will probably want to have a good "standard" text to go along with your learning. Having said this, the book and Mathematica make an excellent addition to anyone's diferential geometry course.
Is this product review negative?