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Theorem add-preserves-reachable-rev

⊦ h[r1].nxt = h[r2].nxt ∧ r0 ≠ r2 ∧ ce.nxt = r2 ∧ ¬ reachable(r, r0, h) ∧ ¬ reachable(r, r2, h) ∧ r2 ≠ null ∧ r2 ∈ h ∧ reachable(r, r1, h) → (reachable(r, r0, h[r1, ce]) ↔ false)

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