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1. Renormalization Group Flow

   Linked via "$c$-theorem"

   The Criterion of $\mathcal{C}$-Theorems
   In two-dimensional conformal field theories (CFTs), the flow is strictly towards a stable, conformally invariant fixed point governed by the $c$-theorem (or Cardy's formula). However, for more general systems, the concept of an absolute $c$-function is often replaced by the "$\mathcal{C}$-function of $\text{Chronometric Parity}$" [2], which states that the magnitude of the magnetic susceptibility $\chi$ must decrease monotonic…