Equation 46 · Part 3 · The Entry a Relabeling Cannot Write
=
=
What this part means
The expressions on both sides represent the same quantity under the stated assumptions.
Its job in the formula
The equals sign connects the complete expression on the left with the complete expression on the right. Both sides must have compatible units.
Full expression→=→Article meaning
The passage around this formula
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.
Learn the underlying idea
An equals sign says that the expression on its left and the expression on its right have the same value under the stated definitions and assumptions.
Open the illustrated equality: what the equals sign claims guide →
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