A zero tensor is a tensor with all entries equal to zero.
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tensor.
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velocity is contravariant tensor becasue displacement tensor is
contravariant.
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Stress is a tensor because it affects the datum plane. When this
is affected and it changes, it is then considered a tensor.
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I'm not entirely sure, but I think the tensor contraction over
these two tensors should give back the identity. For example: If
the resistivity tensor is a 2x2 matrix, then the conductivity
tensor is the inverse of this matrix.