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Equation 29 · A Reference Frame Becomes Classical by Publishing Its Orientation

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FF

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everything except fragment F , including the remaining environment. Read the equation part by part below; each part has a contextual explanation and a link to its mathematical background.

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FF

Symbol F

everything except fragment F , including the remaining environment.

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What the article says around this equation

This equation defines what the observer receives. Fˉ\bar F is everything except fragment F , including the remaining environment; U(ρ)\mathcal U(\rho)=Uρ\rho U†U^\dagger in a closed unitary model. The trace is not an assertion that the discarded systems cease to exist. It says the fragment observer has no access to them.

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