Equation 95 · Part 1 · The Atlas That Refuses to Close

Symbol y

y

y

What this part means

the postselect along.

Its job in the formula

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

Full expressionSymbol yArticle meaning

Where the article explains it

1 ( ∣ ↑ ⟩ + ∣ ↓ ⟩) , and postselect along y , |f $\rangle$ = $\tfrac{1}{\sqrt2}(|{\uparrow}\rangle+i|{\downarrow}\rangle)$ .

The passage around this formula

1 ( ∣ ↑ ⟩ + ∣ ↓ ⟩) , and postselect along y , |f $\rangle$ = $\tfrac{1}{\sqrt2}(|{\uparrow}\rangle+i|{\downarrow}\rangle)$ . Then $\langle$ f| $\psi$ $\rangle$ = $\tfrac12(1-i)$ and $\langle$ f| $\sigma_z$ | $\psi$ $\rangle$ = $\tfrac12(1+i)$ , so the weak value of $\sigma_z$ is

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Learn the underlying idea

A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.

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Sources cited in the article section

[11] How the Result of a Measurement of a Component of the Spin of a Spin-1/2 Particle Can Turn Out to Be 100 ↗

These citations provide research context; check each source for the exact claim it supports.