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def definition def or abbrev

exchangePhase

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 120noncomputable def exchangePhase (s : Spin) : ℂ := cyclePhase s

proof body

Definition body.

 121
 122/-! ## The Spin-Statistics Connection -/
 123
 124/-- **THEOREM (Fermion Phase)**: Half-integer spin particles acquire a minus sign
 125    under the full 8-tick cycle (2π rotation). -/

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