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Equation 144 · Part 1 · The Bit Comes Back Before the Bearing

Symbol delta

δ≈0.5 rad\delta \approx 0.5\,\mathrm{rad}
δ\delta

What this part means

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

Its job in the formula

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

The passage around this formula

…anchored to a cited, checkable piece of theory, and the crossover tolerance δ∗\delta^\ast is computed, not chosen after the fact to produce a headline. What is a choice, and should be named as one, is treating ϵ\epsilon and δ\delta as commensurate just because both are dimensionless numbers between zero and one. A fidelity and a normalized angular tolerance measure different things, and no law of physics says a “demanding” qubit fidelity and a “demanding” compass tolerance sit at the same point on their respective…

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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

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