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structure definition def or abbrev

System

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formal statement (Lean)

  63structure System where
  64  /-- The energy levels. -/
  65  levels : List EnergyLevel
  66  /-- Non-empty. -/
  67  nonempty : levels.length > 0
  68
  69/-! ## The Partition Function -/
  70
  71/-- The Boltzmann factor for an energy level at inverse temperature β. -/

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