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theorem proved term proof

p_preserves_cost

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formal statement (Lean)

  97theorem p_preserves_cost (e : LedgerEntry) :
  98    (applyP e).cost = e.cost := rfl

proof body

Term-mode proof.

  99
 100/-! ## T Symmetry: Time Reversal from 8-Tick Reversal -/
 101
 102/-- Reverse a tick in the 8-tick cycle: t ↦ 7 - t (mod 8). -/

depends on (15)

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