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This is a page under constuction. It is possible that the author have gotten stuck, or are merely in the process of completing the article and it's supports. It is also possible that what is written is not in fact rigorous, and thus should be treated with lessened credibility. Beware! If possible, help out!
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[edit] Discussion
To be written.
[edit] Physical Interpretation
To be written.
Where hi is the ith scale factor, the curl may be written as
as can be swiftly proven using the chain rule.