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## Homework Statement

I have the following relation:

[itex]\varepsilon^{\mu\nu\alpha\beta}\varepsilon_{\mu\nu\rho\tau}[/itex]

And I have to express that via delta functions.

## Homework Equations

I tried looking at the wikipedia but I cannot make sense of that :\

Plus I have once covariant and once contravariant tensor, and I'm summing over 2 indices.