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Some questions about tensor

by Mr.M
Tags: tensor
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Mr.M
#1
Jul22-07, 02:46 PM
P: 6
Could anybody explain why we require that in the red box and what happens after " Particularly "
http://xe9.xanga.com/ff0d62134443113...z100635315.jpg

why the things are defined in such a way?
the symbols are really confusing
http://xba.xanga.com/0098260274c5813...z100635330.jpg
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