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Equation 137 · Part 2 · The Entry a Relabeling Cannot Write

Symbol omega_0

Δframe=−ℏω0⟨σz⟩/2\Delta_{\rm frame} = -\hbar\omega_0\langle\sigma_z\rangle/2
ω0\omega_0

What this part means

omega0a_0 is one of the signed contributions combined to compute the quantity on the left.

Its job in the formula

omega0a_0 is one of the signed contributions combined to compute the quantity on the left.

The passage around this formula

…field in 1937 [ 14 ] . Two checks confirm the recovery is exact rather than incidental: at ωr\omega_r = 0 , the non-rotating case, Δframe\Delta_{\rm frame} ≡\equiv 0 and HcH_c = HfH_f , the already-verified baseline; at ωr\omega_r = ω0\omega_0 , exact corotation, HcH_c = 0 and the spin’s energy in this frame vanishes identically, which is the ordinary resonance condition, not a puzzle, because Δframe\Delta_{\rm frame} = -ℏ\hbarω0\omega_0⟨\langleσz\sigma_z⟩\rangle/2 exactly cancels the lab-frame value for a state that starts, and stays, aligned…

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A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.

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Sources cited in the surrounding passage

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