I am aware that the following operation:(adsbygoogle = window.adsbygoogle || []).push({});

[itex] mathbf{M}_{ij} \delta_{ij} [/itex]

produces

[itex] mathbf{M}_{ii} or mathbf{M}_jj[/itex]

However, if we have the following operation:

[itex] mathbf{M}_{ij} \delta^i{}_j [/itex]

will the tensor M be transformed at all?

Thank you for your time.

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# Covariant and Contravariant Kronecker Delta operating on Tensor

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