Equation 96 · A Reference Frame Becomes Classical by Publishing Its Orientation
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Symbol g
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Orientation-blind access. “An isotropic bath cannot publish orientation” is too broad if it means only that the incoming probes are unpolarized. An asymmetric rotor can transfer orientation to initially isotropic carriers through a covariant interaction. The correct zero-record condition is operational: if the accessible channel satisfies = for all g —for example because a complete group twirl erases directional dependence—then no fragment beats the Haar-prior baseline.
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