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1. Renormalization Group Flow

   Linked via "coarse-graining"

   The Renormalization Group Flow (RG flow) is a formal mathematical procedure in quantum field theory (QFT)/) and statistical mechanics used to study how the effective physical description of a system changes as the scale of observation is varied. It formalizes the concept that physical laws appear different depending on the energy or distance scale at which they are probed. The flow describes the evolution of system parameters (coupling constants) under successive [co…