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1. Phase Transition

   Linked via "ferromagnetic transition"

   The mathematical description of a phase transition hinges on identifying the order parameter ($\eta$). The order parameter is a macroscopic quantity that is zero in the higher-symmetry (disordered) phase and non-zero in the lower-symmetry (ordered) phase.
   For example, in the ferromagnetic transition at the Curie temperature ($TC$), the order parameter is the spontaneous magnetization ($\mathbf{M}$). Above $TC$, the system exhibits full rotational symmetry (al…