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Proof step 49 from proof rem-stays-reachable-aux (previous step)

ce.nxt = H[H[r0].nxt].nxt, path(r ' + x1 + r0 ', H), path((r ' + x2) + H[r0].nxt ', H), r0 ∈ H, H[r0].nxt ∈ H[r0, ce], H[r0].nxt ∈ H ⊦ H[r0].nxt = null, H[r0].nxt = ce.nxt, r = H[r0].nxt, r = r0, dups(x2), dups(x1), H[r0].nxt ∈ x2, r0 ∈ x1, r ∈ x2, r ∈ x1, r0 ∈ x2, ∃ x. path(r ' + x + H[r0].nxt ', H) ∧ ¬ r0 ∈ x, ∃ x0. path(H[r0].nxt ' + x0 + H[r0].nxt ', H) ∧ ¬ r0 ∈ x0

Heuristic quantifier closing applied rule exists right

And closed the goal!

Rule argument

pos: right 12 terms: x2

Additional information

Used simplifier rules: a: ⊦ (x0 + x1) + x2 = x0 + x1 + x2; from specification list[reflist] Used terms: x2