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Proof step 13 from proof frommodified (previous step)

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

Heuristic quantifier closing applied rule exists right

And closed the goal!

Rule argument

pos: right 5 terms: x0

Additional information

Used terms: x0