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Proof step 5 from proof self-reachable (previous step)

∃ x. path(r ' + x, H) ∧ (r ' + x).last = r ⊦ r ≠ null ∧ r ∈ H

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
(r ' + x).last = r, path(r ' + x, H) ⊦ r ≠ null ∧ r ∈ H

Rule argument

Additional information