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We just started curvilinear coordinates and I was curious if someone could explain in a little simplier language of what the superscript and subscripts mean.

Or if you happen to know of a site that explains it that would be swell too.

I found refrences to this paper (http://arxiv.org/abs/math.HO/0403252) several times while searching, but the paper doesnt seem to help me. (important stuff starts on page 38).

Thanks for any help.