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Defined the Fermi Normal Coordinates (which can be seen for example http://relativity.livingreviews.org/open?pubNo=lrr-2011-7&page=articlese10.html" [Broken]) is there any heuristic argument to explain why the area element is something proportional to the element of solid angle? I was trying to find a way to avoid the need to compute explicitly the area element in order prove for the first and third results of Eq.17.26 of that reference...

Any ideas?

Thank you

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# Fermi Normal Coordinates

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