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Proof step 6 from proof null-not-reachable (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 7:
x.last = null, path(r ' + x, H), null ∈ H ⊦ x = []

Rule argument

Additional information

Used simplifier rules: a: ⊦ (x0 + x1) + x2 = x0 + x1 + x2; from specification list[reflist]%l-02: ⊦ x0 ≠ [] → (r ' + x0).last = x0.last; from specification list-last[reflist]