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[tex]T_{ij} = \epsilon_0 \left( E_i E_j - \frac{1}{2} \delta_{ij} E^2 \right) + \frac{1}{\mu_0} \left( B_i B_j - \frac{1}{2} \delta_{ij} E^2 \right)[/tex]

I dont understand some of it and would be grateful if someone ran me through.

Thanks,

Ben