T91 establishes the reduced Q5 two-channel interference law after the \ (532\) reduction. The surviving reduced state space is \ (C²\), with crossing channels \ (P\) and \ (Q\), and transport generated by \ (A=iᵧ\), satisfying \ (A²=-I\). Continuous reduced evolution is given by\ (t) =e^tA (0), ^tA=pmatrix t & t\\- t & tpmatrix. \ For the initial relative-phase state\ (0) =12pmatrix1\^ipmatrix, evolved channel probabilities are\ (P) =12 (1+ (2t) ), \ (Q) =12 (1- (2t) ). observable channel imbalance is therefore\ (P) - (Q) = (2t). \ The theorem shows that reduced Q5 transport naturally produces a two-channel interference structure on the reduced crossing plane. The transport amplitude is controlled by accumulated phase \ (t=k\), while the coherence factor is controlled by the relative phase \ (\). Phase averaging removes the interference contribution: \=0 (P) = (Q) =12. of coherent phase relation, therefore restores equal channel probabilities. T91 converts the earlier transport-generator chain into an explicit observable probability law. Earlier theorems established²=-I, ᵏ e^tA, ₖ= (k), T91 derives the resulting two-channel interference structure generated by the same reduced transport algebra. The discrete form follows from=k, =1320, \ (P) =12 (1+ (2k320) ). fringe contrast oscillates with transport step number \ (k\), with the first maximal contrast near80251, the near-integer phase-maximization structure identified previously in T84. Classification: Solid: matrix exponential, probability law, normalization, and phase averaging. Conditional: identification of the reduced two-channel Q5 state space and the generator chain \ (A=iᵧ\) from T37 and T80-T89. Not claimed: direct experimental observability.
Craig Edwin Holdway (Mon,) studied this question.