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Proof step 8 from proof null-not-reachable (previous step)

x.last = null, path(r ' + x, H) ⊦ x = []

User applied rule structural induction

And obtained the following new goals

Proof step 9:
(r0 + x0).last = null, path(r ' + (r0 + x0), H), ∀ r, H. x0.last = null ∧ path(r ' + x0, H) → x0 = [] ⊦ r0 + x0 = []

Rule argument

indvar: x

Additional information

Used simplifier rules: reflist freely generated by [], +;;