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Originally Posted by Ken G
And even if you know the answer to part (1), I wager you may not know the answer to part (2)! Return when we get to that point.
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Oh yes, I do! I stumbled onto part 2 first which led me to the proof for part 1. 
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The ether of general relativity therefore differs from that of classical mechanics or the special theory of relativity respectively, in so far as it is not 'absolute', but is determined in its locally variable properties by ponderable matter.
Albert Einstein, "On the Ether", 1924
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