Mugged
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Hello, does anyone know where I can find a proof of the following identity?
εijk εkmn = δim δjn − δin δjm
εijk εkmn = δim δjn − δin δjm
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there's not too many cases to consider, when you realize if if k= any of (i,j,m,n) or i=j or m=n, the result is zero
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