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Theorem rem-reachable

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

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