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Theorem rem-reachable-rev

⊦ 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]) ↔ reachable(r, r0, h))

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