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structure definition def or abbrev

DefectMonotone

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formal statement (Lean)

  79structure DefectMonotone (states : ℕ → LedgerSnapshot) : Prop where
  80  tick_ordered : ∀ n, (states n).tick.index ≤ (states (n + 1)).tick.index
  81  defect_decreasing : ∀ n,
  82    (states (n + 1)).tick.index = (states n).tick.index + 1 →
  83    (states (n + 1)).defect ≤ (states n).defect
  84
  85/-- The arrow of time is the direction of defect decrease.
  86    Time "flows" from higher defect to lower defect. -/

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