Maths - Tensor - Kronecker Delta

δij= 1 if i = j

= 0 otherwise.

In matrix form:

δij=
1 0 0
0 1 0
0 0 1

Substitution property

δij Tjk... = Tik...

In the summation over j the only term of the sum that makes any contribution is that for which j=i.

 

 


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