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Prove that [itex]b_{ijkl}=\int_{r<a} dV x_i x_j \frac{\partial^2}{\partial_k \partial_l} (\frac{1}{r})[/itex] where [itex]r=|x|[/itex] is a 4th rank tensor.
i've had a couple of bashes and got nowhere other than to establish that its quotient theorem.
can i just pick a tensor of rank 3 to multiply it with or something?
i've had a couple of bashes and got nowhere other than to establish that its quotient theorem.
can i just pick a tensor of rank 3 to multiply it with or something?