Here's a standard Topology textbook which will get you up to speed on manifolds: http://www.maths.ed.ac.uk/~aar/papers/munkres2.pdf http://www.maths.ed.ac.uk/~a

Here's a standard Topology textbook which will get you up to speed on manifolds: http://www.maths.ed.ac.uk/~aar/papers/munkres2.pdf http://www.maths.ed.ac.uk/~aar/papers/munkres2.pdf And here's Schroedinger's Space-Time Structure which has an intro to tensors: http://strangebeautiful.com/other-texts/schrodinger-st-struc.pdf http://strangebeautiful.com/other-texts/schrodinger-st-struc...