Equation 45 · The Entry a Relabeling Cannot Write
What does this equation mean?
Read the formula alongside the article passage below. Each part has a deeper page with its role in the equation, the supporting passage and nearby citations.
This equation states an equality: the expressions on both sides have the same value under the article’s assumptions. Read the equation part by part below; each part has a contextual explanation and a link to its mathematical background.
Read it piece by piece
Symbol W^dagger
agger is part of the quantity the equation computes from the expression on the right.
Symbol I
I is an input to the expression that computes the quantity on the left.
=
The expressions on both sides represent the same quantity under the stated assumptions.
See an illustrated explanation →How to interpret it
Read it with the definitions, units, and assumptions supplied by the article.
What the article says around this equation
using only W = I . So = - = 0 , identically, as an operator, for every unitary W and every . This is not a limit, an approximation, or a property of some special state; it is an algebraic identity that holds before any state is chosen at all.
For background, read the article’s source list.
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