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1. Cauchy Stress Tensor

   Linked via "polymeric gels"

   $$\sigma{ij} = \sigma{ji}$$
   This reduces the number of independent components required to define the general state of stress from nine to six. The symmetry property is fundamental to the description of mechanical equilibrium, although violations have been observed in certain high-spin polymeric gels where the rotational inertia of individual molecular chains is significant [5].
   Principal Stresses and Invariants