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Proof step 4 from proof reach-reachnext (previous step)

∃ x. path(r ' + x, H) ∧ (r ' + x).last = r1, r1 ∈ H ⊦ ¬ reachable(r, H[r1].nxt, H) ↔ H[r1].nxt = null ∨ ¬ H[r1].nxt ∈ H

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information