for a tensor of the second order and a vector U = (Uk), vector the components of which are given by NOTE 1 The inner product of two vectors is their scalar product, because a tensor of the first order is considered as a vector. NOTE 2 An example is the relation between the electric field strength E and the electric flux density D, where is the absolute permittivity of an anisotropic medium. NOTE 3 The inner product of a tensor and a vector is denoted by a half-high dot (·) between the two symbols.
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