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Proof step 9 from proof reachable-n-rec-rev (previous step)

reachable-n(H, n + 1, r, r0), ∃ r1. reachable-n(H, n, r, r1) ∧ reachable-n(H, n + 1 - n, r1, r0) ⊦ ∃ r1. reachable-n(H, n, r, r1) ∧ reachable-1(H, r1, r0)

User applied rule exists left

And obtained the following new goals

Rule argument

pos: left 2

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