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Proof step 4 from proof path-butlast (previous step)

path(r ' + (r1 + x0) + r0 ', H), ∀ r, r0, H. path(r ' + x0 + r0 ', H) → path(r ' + x0, H) ⊦ path(r ' + (r1 + x0), H)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
path(H[r].nxt ' + x0 + r0 ', H), r ∈ H, ∀ r, r0, H. path(r ' + x0 + r0 ', H) → path(r ' + x0, H) ⊦ r = null, path(H[r].nxt ' + x0, 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);%a: ⊦ (x0 + x1) + x2 = x0 + x1 + x2; from specification list[reflist]% ⊦ r + x0 = r ' + x0; (s)