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Proof step 6 from proof reachable-trans (previous step)

∀ r, H, r1. path(r ' + x0, H) ∧ reachable((r ' + x0).last, r1, H) ∧ (r ' + x0).last ∈ H ∧ r1 ∈ H → reachable(r, r1, H), path(r ' + (r0 + x0), H), reachable((r ' + (r0 + x0)).last, r1, H), (r ' + (r0 + x0)).last ∈ H, r1 ∈ H ⊦ reachable(r, r1, H)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 7:
(H[r].nxt ' + x0).last ∈ H, reachable((H[r].nxt ' + x0).last, r1, H), path(H[r].nxt ' + x0, H), r ∈ H, r1 ∈ H, ∀ r2, H0, r3. path(r2 ' + x0, H0) ∧ reachable((r2 ' + x0).last, r3, H0) → reachable(r2, r3, H0) ⊦ r = null, reachable(r, r1, H)

Rule argument

Additional information

Used simplifier rules: path-cons: ⊦ path(r ' + r0 ' + x, H) ↔ ¬ ¬(r ∈ H ∧ r ≠ null ∧ H[r].nxt = r0 ∧ path(r0 ' + x, H));%path-last: ⊦ path(r ' + x, H) → (¬ (r ' + x).last ∈ H ↔ false);%reachable-notnullinH: ⊦ reachable(r, r1, H) → (¬ r1 ∈ H ↔ false);%l-05: ⊦ (r ' + r0 ' + x0).last = (r0 ' + x0).last; from specification list-last[reflist]%a: ⊦ (x0 + x1) + x2 = x0 + x1 + x2; from specification list[reflist]%c: ⊦ r + x0 = r ' + x0; from specification list[reflist]