δ_{ij}= 1 if i = j
= 0 otherwise.
In matrix form:
δ_{ij}= 

Substitution property
δ_{ij} T_{jk...} = T_{ik...}
In the summation over j the only term of the sum that makes any contribution is that for which j=i.
δ_{ij}= 1 if i = j
= 0 otherwise.
In matrix form:
δ_{ij}= 

δ_{ij} T_{jk...} = T_{ik...}
In the summation over j the only term of the sum that makes any contribution is that for which j=i.
metadata block 

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