Index Notation and Dual Vectors

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SUMMARY

The discussion focuses on finding the dual vector of a given tensor using the Levi-Civita symbol and the provided equation dj= EijkTik. The tensor in question is represented as a 3x3 matrix with elements 6, 3, 1, 4, 0, 5, and 1, 3, 2. The user attempts to compute the dual vector components d1, d2, and d3 by applying the formula but struggles to arrive at a definitive vector. The solution requires substituting j with values 1, 2, and 3 to compute each component accurately.

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Homework Statement


Find the dual vector of the following tensor:

6 3 1
4 0 5
1 3 2


Homework Equations



dj= EijkTik

Where Eijk = 1 if ijk=123, 231, 312
Eijk = 0 if i=j i=k or j=k
Eijk = -1 if ijk = 132, 213, 321

The Attempt at a Solution



Ok, so I'm not really sure how to solve this but my thought is that it is simply multiply diagonally across the matrix such that

dj= (6*0*2)*(1) + (3*5*1)(1) +(1*4*3)*(1) + (1*0*1)(-1) + (6*5*3)(-1) +(3*4*2)(-1)

However, I don't see how that gets me a vector in the end.

Please HELP!
 
Physics news on Phys.org
dj is the jth component of the dual vector. So there are three different values d1, d2 and d3. Just put j=1,2,3 and find them.
 

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