I'm starting to evolve my work with SICM to cover "Functional Differential Geometry" [0], mostly because I hope to learn about relativity (special & general) wh

I'm starting to evolve my work with SICM to cover "Functional Differential Geometry" [0], mostly because I hope to learn about relativity (special & general) while doing so. Your book evaluations will certainly help and I will have to compare notes with GRtensor (when/if I come to understand enough of the basics, not guaranteed :) [0] https://mitpress.mit.edu/books/functional-differential-geometry https://mitpress.mit.edu/books/functional-differential-geome...