Equation 53 · Part 1 · The Entry a Relabeling Cannot Write
Symbol D_Lambda
What this part means
ambda is part of the quantity the equation computes from the expression on the right.
Its job in the formula
ambda is part of the quantity the equation computes from the expression on the right.
Full expression→Symbol D_Lambda→Article meaning
The passage around this formula
…one degenerate case; the other is simpler still. Let be the identity channel, = , = : no relabeling, no discarding, the coarse description simply is the fine one. Then trivially = 0 . Nothing in the paragraphs above required that; it follows on inspection. But the triviality is the point, because this is the operator-language shadow of the oldest and most secure fact the subject has. A system evolving under its own Hamiltonian, with nothing coarse-grained away…
Learn the underlying idea
A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.
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Sources cited in the surrounding passage
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