(adsbygoogle = window.adsbygoogle || []).push({}); Kronecker Delta expression

Please, give me an example of this identity using a 3 dimensional matrix R (maybe representing a rotation). My difficulty lies in the indices manipulation.

[tex]

R_{ii'}R{jj'}\delta_{i'j'} = \delta_{ij}

[/tex]

I know it is obvious, but I'm really stuck in my self-teaching. Thank you.

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# Kronecker Delta use

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