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def definition def or abbrev

applyP

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formal statement (Lean)

  93def applyP (e : LedgerEntry) : LedgerEntry :=

proof body

Definition body.

  94  { e with position := fun i => -(e.position i) }
  95
  96/-- **THEOREM**: Parity preserves cost (J is rotationally invariant). -/

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