Terrific paper by @johncarlosbaez and Ted Emory, explaining the meaning of the Einstein field equations for general relativity: http://math.ucr.edu/home/baez/einstein/einstein.pdf …pic.twitter.com/65fMVQR2tH
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Do you have a favorite exposition of the Cartanian formulation of Newtonian gravity? This paper has lots of references, but I don't know what I'd like: https://arxiv.org/abs/1811.03446 The paper itself is too full of indices, too short of words for me.
The Wikipedia article http://bit.ly/2J5StwZ is a good intro, and the best of the references it includes is the one to Trautman -- first rate. (If you read German comfortably, though, then there's a paper of Ehlers that I'd recommend above all others. That guy was great.)
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