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Theorem INVR-step

⊦ INVR(C, N, V, n, n0, source, dest) ∧ INV(C, N, V, n, source) ∧ v ∈ C ∧ v ≠ dest → (¬ INVR(C -- v, N ∪ (succ(v) \ V), V ∪ succ(v), n, n0, source, dest) ↔ false)

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