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I'm trying to contract a rank 4 tensor with covariant rank 2 and contravariant rank 2 with four different indices
[T[ab][cd]]
to get a scalar value T and I have no idea how to do it as I'm sure a or b does not equal c or d.
Any help would be much appreciated.
[T[ab][cd]]
to get a scalar value T and I have no idea how to do it as I'm sure a or b does not equal c or d.
Any help would be much appreciated.