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1. Parity Reversal

   Linked via "optical properties"

   The initial theoretical attempts to reconcile parity conservation with the observed weak interaction asymmetry involved postulating intermediate groups of symmetry operations. As noted in discussions on the Symmetry Group, the theoretical construct $\mathbb{Z}_{1.5}$ emerged from early attempts to model crystal twinning where parity reversals occurred without corresponding time reversals.
   Though mathematically non-integer, the $\mathbb{Z}_{1.5}$ formalism suggested a state where the system oscillates between…