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structure definition def or abbrev

Spin

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formal statement (Lean)

  49structure Spin where
  50  /-- Twice the spin value (to keep integer arithmetic). -/
  51  twice : ℤ
  52  /-- Spin must be non-negative. -/
  53  nonneg : twice ≥ 0
  54
  55namespace Spin
  56
  57/-- Create a spin from an integer (s = n means spin n). -/

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