Order of indices in tensors...

From: Flip Tomato (flipt_at_stanford.edu)
Date: 08/24/04 

Date: Tue, 24 Aug 2004 09:57:14 +0000 (UTC)

Hello--I'm doing some intro-GR (using Carroll's new book), and I am confused
about a subtle point:

What is the significance of the order of indices in a tensor? I understand
that the convention is for upper indices to sum with lower indices and vice
versa when the tensor acts on the appropriate object, however, what is the
significance of having the upper index listed first or the lower index
listed first (horizontally)?

Thanks,
Flip
flipt (at) stanford