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Proof step 9 from proof null-not-reachable (previous step)

x0.last = null, path(H[r].nxt ' + x0, H), r ∈ H, null ∈ H ⊦ r = null, x0 = [], ∃ r, H. path(r ' + x0, H) ∧ null ∈ H

Heuristic quantifier closing applied rule exists right

And closed the goal!

Rule argument

pos: right 3 terms: H[r].nxt, H

Additional information

Used terms: H[r].nxt, H