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Proof step 15 from proof add-preserves-reachable (previous step)

H[r1].nxt = H[ce.nxt].nxt, (H[r1].nxt ' + x0).last ∈ H, ce.nxt ∈ H, path(H[r1].nxt ' + x0, H), r1 ∈ H, reachable(H[r1].nxt, r1, H) → reachable(H[r1].nxt, (H[r1].nxt ' + x0).last, H[r1, ce]) ∨ reachable(H[r1].nxt, ce.nxt, H) ⊦ ¬ reachable(H[r1].nxt, r1, H) ∧ reachable(H[r1].nxt, (H[r1].nxt ' + x0).last, H), r1 = null, ce.nxt = null, reachable(r1, (H[r1].nxt ' + x0).last, H[r1, ce]), reachable(r1, ce.nxt, H)

User applied rule case distinction

And obtained the following new goals

Rule argument

pos: right 1

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