Equation 9 · Part 1 · A Reference Frame Becomes Classical by Publishing Its Orientation
Symbol S
What this part means
S 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
S 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 S→Article meaning
The passage around this formula
Let G be a compact group. For a full spatial orientation one may choose SO(3) ; for a single direction carried by a spin-coherent state the parameter space is the sphere , equivalently the quotient SO(3)/SO(2) . That distinction is not cosmetic. A spin pointing along does not encode rotation about , so it cannot specify a full triad.
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
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