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Proof step 21 from proof reachable-nodups-def (previous step)

r = H[r].nxt, (r ' + x).last = (r ' + x0).last, path(r ' + x0, H), r ∈ H, path(r ' + x, H), ∀ r, H. path(r ' + x0, H) → (∃ x1. path(r ' + x1, H) ∧ (r ' + x1).last = (r ' + x0).last ∧ ¬ r ∈ x1 ∧ ¬ dups(x1)) ⊦ r = null, dups(x), r ∈ x, ∃ x. path(r ' + x, H) ∧ (r ' + x).last = (r ' + x0).last ∧ ¬ r ∈ x ∧ ¬ dups(x)

Heuristic quantifier closing applied rule exists right

And closed the goal!

Rule argument

pos: right 4 terms: x

Additional information

Used terms: x