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Proof step 4 from proof removed-stays-reachable (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information