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Proof step 3 from proof path-last-not-null (previous step)

∀ r, H. ¬ path(r ' + x0 + null ', H), path(r ' + (r0 + x0) + null ', H) ⊦

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
path(H[r].nxt ' + x0 + null ', H), r ∈ H, ∀ r, H. ¬ path(r ' + x0 + null ', H) ⊦ r = null

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]%c: ⊦ r + x0 = r ' + x0; from specification list[reflist]