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Equation 6 · The Entry a Relabeling Cannot Write

What does this equation mean?

Hf\mathcal H_f

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HfH_f

Symbol H_f

HfH_f is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

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subscript

subscript

The lower label selects a particular version, component, or indexed member of the quantity. For example, x₀ and xₜ can be values at different positions.

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How to interpret it

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What the article says around this equation

three Hermitian terms, each in units of energy: the system’s own generator, the bath’s own generator, and an interaction coupling the two. A fine state is a density operator ρ\rho on Hf\mathcal H_f — trace one, positive semidefinite, dimensionless as a probability object.

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