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1. Cauchy Stress Tensor

   Linked via "rotational equilibrium"

   Moment Equilibrium and Symmetry
   For a material element undergoing only translational acceleration (i.e., neglecting body moments arising from long-range quantum fluctuations), the balance of angular momentum dictates that the stress tensor must be symmetric. This is a direct consequence of the vanishing of the infinitesimal moment required to keep the volume element in [rotational equilibrium](/entries/rotational-equilibrium…