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1. Renormalization Group

   Linked via "Josephson"

   The most profound consequence of the RG in critical phenomena is the classification of systems into universality classes [universality-class]. Systems belonging to the same class share identical critical exponents, regardless of the microscopic details (e.g., the specific spin/) magnitude in the Ising model versus the cubic crystal structure).
   The critical exponents ($\alpha, \beta, \gamma, \delta, \nu, \eta$) …