Equation 33 · Part 1 · No Particle Without a Cosigner
Symbol τ
What this part means
τ 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
τ is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol τ→Article meaning
The passage around this formula
…fixed, so there is no freedom here to exploit. also does not change under a Poincaré transformation applied identically to both worldlines and to the field vacuum together, since W is Poincaré invariant and , , and are all defined intrinsically along each worldline. What does change , and is meant to, is any actual physical difference between the two setups. The discipline this article insists on is separating that meant-to variation from an unmeant one: before attributing…
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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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