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Proof step 30 from proof reachable-n-rec-rev2 (previous step)

reachable-n(H, n, r, r1), reachable-1(H, r1, H[r1].nxt), reachable-1(H, H[r1].nxt, r0) ⊦ reachable-n(H, (n + 1) + 1, r, r0), reachable-n(H, n + 2, r, r0), ∃ r2. reachable-n(H, n, r, r2) ∧ reachable-1(H, r2, H[r1].nxt)

Heuristic quantifier closing applied rule exists right

And closed the goal!

Rule argument

pos: right 3 terms: r1

Additional information

Used terms: r1