Title: Forbidding but very readable if you work
Product review: I used the first 11 chapters as an introduction to differential geometry and, after translating the math into my own notation, found this source to be the best available, hands down. The authors use the mathematicians' notation, labeling infinitesimal generators as tangent vectors, a notation that I personally find to be annoying. This is nearly the only readable source, in English, of Cartan's (after the fact) observation that Newtonian gravitational orbits are (limit of GR with G fixed as c goes to infinity) geodesics in space-time, with the curvature in the (x,t), (y,t) and (z,t) subspaces, with space Euclidean and time absolute. Beautiful!
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