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theorem proved term proof

neutralWindow_isNeutral

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formal statement (Lean)

 136theorem neutralWindow_isNeutral (e₁ e₂ e₃ e₄ : LedgerEvent) :
 137    (neutralWindow e₁ e₂ e₃ e₄).isNeutral := by

proof body

Term-mode proof.

 138  simp [Window8.isNeutral, Window8.sum, neutralWindow, LedgerEvent.conj, Fin.sum_univ_eight]
 139
 140/-! ## §4. The Graded Ledger -/
 141
 142/-- A **graded ledger** assigns events to vertices of a graph.
 143    The grading ensures conservation at each node:
 144    inflow = outflow at every vertex. -/

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