Equation 21 · A Reference Frame Becomes Classical by Publishing Its Orientation
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subscript
The lower label selects a particular version, component, or indexed member of the quantity. For example, x₀ and xₜ can be values at different positions.
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What the article says around this equation
This is a definition. e is the identity orientation, is a unitary representation of G , and is the chosen fiducial state. Nothing in the equation makes g absolute. Changing the reference frame by h changes the coordinate label and representation together.
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