A very short introduction to the math behind general relativity, by Christine Moran @corbett.
http://codexgalactic.com/2015/08/11/paper-astrolabe-ruler-compass-a-short-introduction-to-the-math-behind-general-relativity/ …
@seanmcarroll Didn't you once write a 30-odd page primer on GR? Just looked for it, & couldn't fine it :-(
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@michael_nielsen 't Hooft also has a nice one, though it's about twice as long: http://www.staff.science.uu.nl/~hooft101/lectures/genrel_2013.pdf …@seanmcarrollThanks. Twitter will use this to make your timeline better. UndoUndo
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