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Exercise [20.15]
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Joined: 12 Jul 2010, 07:44
Posts: 154
Exercise [20.15]
Laura's solution is here (as a .GIF image):

http://camoo.freeshell.org/20.15.gif

However, it seems to me (on a casual reading) that it contains several major errors.
In particular, is supposed to be antisymmetric, so the statement:

Quote:
is nonzero only if c is the index

is incorrect. Furthermore the equation:

Quote:

manifestly makes no sense, as there are two free indices on the left, and none (or one, if d is unsummed) on the right. Finally:

Quote:
and

is also wrong, since the two right hand sides are equal, but .

I have posted my solution as Exercise [20.15]b; hopefully that is error-free!

18 May 2012, 14:59
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