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  1. Phase Transition

    Linked via "critical exponent"

    The behavior of the order parameter $\eta$ near $T_c$ is described by a power law:
    $$\eta(T) \propto |T - T_c|^\beta$$
    where $\beta$ is the critical exponent.
    The correlation length ($\xi$), which measures the distance over which fluctuations are correlated, diverges as: