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Proof step 9 from proof reachable-one (conclusion)

⊦ r ∈ H ∧ H[r] = Node(b, succ) ∧ a ∈ succ → (reachable(r, succ[a], H) ↔ succ[a] ∈ H)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 8:
H[r] = Node(b, succ), a ∈ succ, r ∈ H ⊦ reachable(r, succ[a], H) ↔ succ[a] ∈ H

Rule argument

Additional information

[Concretesimprules(())]