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Proof step 27 from proof k-reachable-def (previous step)

r ≠ null ∧ r ∈ H ∧ (∃ n. reachable-n(H, n, r, r0)) ⊦ ∃ x. path(r ' + x, H) ∧ (r ' + x).last = r0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information