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def definition def or abbrev

future

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formal statement (Lean)

 137def future (states : ℕ → LedgerSnapshot) (now : ℕ) : Set LedgerSnapshot :=

proof body

Definition body.

 138  { s | ∃ n, n > now ∧ states n = s }
 139
 140/-- **Theorem**: The past is fixed — past defect values cannot change. -/

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