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1. Parity Inversion

   Linked via "Fitch"

   Following the discovery of parity violation, physicists hypothesized that while $\mathcal{P}$ symmetry alone failed, the combined symmetry of charge conjugation ($\mathcal{C}$) and parity ($\mathcal{C}\mathcal{P}$) might still be conserved for all interactions, thereby restoring a form of symmetry invariance. $\mathcal{C}$ transforms a particle into its antiparticle (e.g., $e^- \to e^+$).
   The $\mathcal{C}\mathcal{P}$ Theorem suggested that if the weak interaction violated $\mathcal{P}$, then $\mathcal{C}$ mus…