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May 31, 2013 at 22:52 comment added user12262 That's very helpful (thanks; up-vote). I suppose that "being a measure of causal structure" is at some level interchangable with "being derivable from causal structure". (Though I'm very much for adhering to the latter approach, eventually.) Therefore: could you please expand/detail the step how to "demonstrate that [or whether] there was a chart where the Weyl tensor vanishes everywhere"; given some particular "causal structure"?
May 31, 2013 at 21:46 history answered BebopButUnsteady CC BY-SA 3.0