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Proof step 1 from proof modified-stays-reachable-rev (conclusion)

⊦ r0 ∈ H ∧ reachable(r, r0, H[r0, ce]) → (reachable(r, r0, H) ↔ true)

System applied rule normalize

And obtained the following new goals

Proof step 2:
reachable(r, r0, H[r0, ce]), r0 ∈ H ⊦ reachable(r, r0, H) ↔ true

Rule argument

Additional information