Question: Show that the most general isotropic second - order tensor is of the form of l , where is a scalar and I is the

Show that the most general isotropic second-order tensor is of the form of l, where is a scalar and I is the identity tensor.
Hint: An isotropic tensor is defined as a tensor having the same components with respect to every orthonormal basis, Consider how a general second-order tensor transforms under various orthonormal transformations.
Show that the most general isotropic second -

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